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Anatomy - Muscles Block 1
Block 1 Muscles
160
Anatomy
Graduate
08/28/2010

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Term
Pectoral Region
Definition
Pectoralis Major, Pectoralis Minor, Subclavius, Serratus Anterior
Term
Pectoralis Major - Origin
Definition
Clavicular head- medial half of clavicle... Sternal head - runs from sternum, costal cartilages of ribs 1-6 and aponeurosis of external oblique m.
Term
Pectoralis Major - Insertion
Definition
Intertubercular (Bicipital) groove of humerus
Term
Pectoralis Major - Innvervation
Definition
Lateral pectoral n. and Medial pectoral n.
Term
Pectoralis Major - Blood Supply
Definition
Lateral thoracic a. and Thoracoacromial a. (Pectoral branch)
Term
Pectoralis Major - Function
Definition
Both Adduct and medial rotates arm... Clavicular head - flexes the shoulder... Sternocostal head - extends arm
Term
Pectoralis Minor - Origin
Definition
Ribs 3-5 near costal cartiledge
Term
Pectoralis Minor - insertion
Definition
Caracoid process of scapula
Term
Pectoralis Minor - Innervation
Definition
Medial pectoral n.
Term
Pectoralis Minor - Blood Supply
Definition
Lateral thoracic a. and Thoracromial a. (Pectoral Branch)
Term
Pectoralis Minor - Fuction
Definition
Protracts and depresses the scapula... shoulder stabilizer
Term
Subclavius - Origin
Definition
1st rib and 1st costal cartiledge
Term
Subclavius - Insertion
Definition
Middle 3rd of clavicle
Term
Subclavius - Innervation
Definition
Nerve to the subclavius C5 and C6
Term
Subclavius - Blood Supply
Definition
Thoracoacromial a. (clavicular branch)
Term
Subclavius - Function
Definition
Depresses and anchors the clavicle
Term
Serratus Anterior - Origin
Definition
Lateral surfaces of ribs 1 - 8
Term
Serratus Anterior - Insertion
Definition
Medial border of the scapula
Term
Serratus Anterior - Innervation
Definition
Long thoracic n. C5 - C7
Term
Serratus Anterior - Blood Supply
Definition
Lateral thoracic a.
Term
Serratus Anterior - Function
Definition
Superiorly rotates the scapula, depress and protects scapula, holds scapula against the thoracic wall... injury causes "winged scapula"
Term
Back Muscles - Superficial:
Definition
Trapezius, Latissimus Dorsi, Rhomboid Major, Rhomboid Minor, Levator Scapulae, Serratus Posterior Superior, Serratus Posterior Inferior
Term
Trapezius - Origin
Definition
Laterally - Acromion, spine of scapula, lateral 3rd of clavicle
Term
Trapezius - Insertion
Definition
Medially - Skull (medial 3rd of superior nuchal line), Cervical and thoracic spinous processes
Term
Trapezius - Innervation
Definition
CN XI (accessory nerve), Anterior rami C3 and C4
Term
Trapezius - Blood Supply
Definition
Transvercervical a.
Term
Trapezius - Function
Definition
Superior - Extend skull, elevate scapula... Mid - Retract scapula... Inferior - Depress scapula... Sup. + Inf. - Superiorly Rotates Scapula
Term
Latissimus Dorsi - Origin
Definition
Medially and Inferiorly - Spinous process (T7 - T12), Ribs 9-12, Thoracolumbar fascia, Lumbar aponorosis, Iliac crest
Term
Latissimus Dorsi - Insertion
Definition
Laterally and superiorly - Intertubercular Bicipital groove of humerus
Term
Latissimus Dorsi - Innervation
Definition
Thoracodorsal n. (Middle Subscapular)
Term
Latissimus Dorsi - Blood Supply
Definition
Thoracodorsal a.
Term
Latissimus Dorsi - Function
Definition
Extend arm, Adducts arm, Medially rotates arm
Term
Rhomboid Major - Origin
Definition
Spinous process of T2-T5 vertebrae
Term
Rhomboid Major - Insertion
Definition
Medial border of scapula
Term
Rhomboid Major - Innervation
Definition
Dorsal scapular n.
Term
Rhomboid Major - Blood Supply
Definition
Dorsal scapular a.
Term
Rhomboid Major - Function
Definition
Retract scapula, Inferiorly rotate scapula
Term
Rhomboid Minor - Origin
Definition
Spinous process of T1 and higher vertebrae
Term
Rhomboid Minor - Insertion
Definition
Medial border of scapula
Term
Rhomboid Minor - Innervation
Definition
Dorsal scapular n.
Term
Rhomboid Minor - Blood Supply
Definition
Dorsal scapular a.
Term
Rhomboid Minor - Function
Definition
Retract scapula, Inferiorly rotate scapula
Term
Levator Scapulae - Origin
Definition
Transverse process of cervical vertebrae
Term
Levator Scapulae - Insertion
Definition
Superior medial border of scapula
Term
Levator Scapulae - Innervation
Definition
Dorsal scapular n. + anterior rami C3 + C4
Term
Levator Scapulae - Blood Supply
Definition
Dorsal scapular a.
Term
Levator Scapulae - Function
Definition
Elevates scapula, Inferior rotation of scapula
Term
Serratus Posterior Superior - Origin
Definition
Cervical and thoracic spinous processes
Term
Serratus Posterior Superior - Insertion
Definition
Upper ribs
Term
Serratus Posterior Superior - Innervation
Definition
Intercostal nerves
Term
Serratus Posterior Superior - Blood Supply
Definition
Intercostals a.
Term
Serratus Posterior Superior - Function
Definition
Helps respiration, Pulls ribs up
Term
Serratus Posterior Inferior - Origin
Definition
Thoracic and Lumbar spinous processes
Term
Serratus Posterior Inferior - Insertion
Definition
Lower ribs
Term
Serratus Posterior Inferior - Innervation
Definition
Intercostals n.
Term
Serratus Posterior Inferior - Blood Supply
Definition
Intercostals a.
Term
Serratus Posterior Inferior - Function
Definition
Helps respiration, Pulls ribs down
Term
Back Muscles - Deep Back - Erector Spinae:
Definition
Spinalis, Longissimus, Iliocostalis
Term
Spinalis - Origin
Definition
Spinous processes of vertebrae, Posterior sacrum and Iliac crest
Term
Spinalis - Insertion
Definition
Spinous processes higher up
Term
Spinalis - Innvervation
Definition
Primary dorsal rami
Term
Spinalis - Blood Supply
Definition
Spinal a.
Term
Spinalis - Function
Definition
Extend vertebral column, Laterally flex vertebral column
Term
Longissimus - Origin
Definition
Transverse processes of vertebrae, Posterior sacrum and iliac crest
Term
Longissimus - Insertion
Definition
Mastoid Process of skull
Term
Longissimus - Innervation
Definition
Primary dorsal rami
Term
Longissimus - Blood Supply
Definition
Spinal a.
Term
Longissimus - Function
Definition
Extend vertebral column, Laterally flex vertebral column
Term
Iliocostalis - Origin
Definition
Superior to transverse processes, Posterior - sacrum and iliac crest
Term
Iliocostalis - Insertion
Definition
Angles of ribs
Term
Iliocostalis - Innervation
Definition
Primary dorsal rami
Term
Iliocostalis - Blood Supply
Definition
Spinal a.
Term
Iliocostalis - Function
Definition
Extend vertebral column, Laterally flex vertebral column
Term
Back Muscles - Deep Back - Deep Layer:
Definition
Splenius capitis et cervicis, Semispinalis capitis, Semispinalis cervicis, Multifidus, Rotatores, Interspinalis, Intertransversarii
Term
Splenius capitis et cervicis - Origin
Definition
Spines of vertebrae T6 and higher... Transverse process of upper thoracic or cervical vertebra
Term
Splenius capitis et cervicis - Insertion
Definition
Skull
Term
Splenius capitis et cervicis - Innervation
Definition
Primary dorsal rami
Term
Splenius capitis et cervicis - Blood Supply
Definition
Spinal a.
Term
Splenius capitis et cervicis - Function
Definition
Extends neck... Laterally flex head and neck
Term
Semispinalis capitis - Origin
Definition
Transverse process of upper thoracic or cervical vertebra
Term
Semispinalis capitis - Insertion
Definition
Skull between superior and inferior nuchal lines
Term
Semispinalis capitis - Innervation
Definition
Primary dorsal rami
Term
Semispinalis capitis - Blood Supply
Definition
Spinal a.
Term
Semispinalis capitis - Function
Definition
Extend/Laterally rotate head (cerv2).. Holds head up, keeps neck straight
Term
Semispinalis cervicis - Origin
Definition
Cervical transverse processes
Term
Semispinalis cervicis - Insertion
Definition
Cervical spinal processes
Term
Semispinalis cervicis - Innervation
Definition
Primary dorsal rami
Term
Semispinalis cervicis - Blood Supply
Definition
Spinal a.
Term
Semispinalis cervicis - Function
Definition
Holds head up, keeps neck straight
Term
Multifidus - Origin
Definition
Transverse processes of vertebrae S5 to C1
Term
Multifidus - Insertion
Definition
Spinal process 2 - 4 vertebral segments up
Term
Multifidus - Innervation
Definition
Primary dorsal rami
Term
Multifidus - Blood supply
Definition
Spinal a.
Term
Multifidus - Function
Definition
Extend and rotate vertebral column
Term
Rotatores - Origin
Definition
Transverse processes
Term
Rotatores - Insertion
Definition
Spinal processes 2 or 3 vertebrae up (1 or 2 intervertebral spaces)
Term
Rotatores - Innervation
Definition
Primary dorsal rami
Term
Rotatores - Blood Supply
Definition
Spinal a.
Term
Rotatores - Function
Definition
Extends and rotates vertebral column
Term
Interspinalis - Origin
Definition
Spinal processes
Term
Interspinalis - Insertion
Definition
Spinal processes
Term
Interspinalis - Innervation
Definition
Primary dorsal rami
Term
Interspinalis - Blood Supply
Definition
Spinal a.
Term
Interspinalis - Function
Definition
Extends vertebral canal
Term
Intertransversarii - Origin
Definition
Transverse processes
Term
Intertransversarii - Insertion
Definition
Transverse processes
Term
Intertransversarii - Innervation
Definition
Primary dorsal rami
Term
Intertransversarii - Blood Supply
Definition
Spinal a.
Term
Intertransversarii - Function
Definition
Extends and laterally flexes vertebral canal
Term
Lateral Cervical Region (Posterior Cervical Triangle):
Definition
Platysma, Sternocleidomastoid, Belly or Posterior Omohyoid, Scalene mm
Term
Platysma - Origin
Definition
Skin
Term
Platysma - Insertion
Definition
Fascia covering pectoralis and deltoid majors
Term
Platysma - Innervation
Definition
Facial nerve CN VII
Term
Platysma - Blood Supply
Definition
Superficial vessels of the neck
Term
Platysma - Function
Definition
Draws skin of neck superiorly when teeth are clenched
Term
Sternocleidomastoid - Origin
Definition
Mastoid process of the skull
Term
Sternocleidomastoid - Insertion
Definition
Manubrium of the sternum and medial 3rd of the clavicle
Term
Sternocleidomastoid - Innervation
Definition
Accessory nerve CN XI
Term
Sternocleidomastoid - Blood Supply
Definition
?
Term
Sternocleidomastoid - Function
Definition
Protects carotid a. and internal jugular v. ... Bilaterally - Pulls the head anteriorly ... Unilaterally - rotates and tilts the head (causing face to look up and away from the contracting side)
Term
Posterior Belly of the Omohyoid - Origin
Definition
Superior border of scapula
Term
Posterior Belly of the Omohyoid - Insertion
Definition
Inferior border of hyoid bone
Term
Posterior Belly of the Omohyoid - Innervation
Definition
Anterior rami C1-C3
Term
Posterior Belly of the Omohyoid - Blood Supply
Definition
?
Term
Posterior Belly of the Omohyoid - Function
Definition
Moves and stabilizes the hyoid bone (i.e. during swallowing)
Term
Scalene mm. - Origin
Definition
Transverse process of C2 - C7
Term
Scalene mm. - Insertion
Definition
1st or 2nd Rib
Term
Scalene mm. - Blood Supply
Definition
?
Term
Scalene mm. - Function
Definition
Bilaterally - Raise first 2 ribs (heavy breathing)... Unilaterally - Flex the neck to one side. Gap between anterior and middle scalene mm. is the interscalene triangle - the subclavian artery and the brachial plexus (the blood and nerve supplies for the upper limb) pass through this gap.
Term
Muscles of the Shoulder (Rotator Cuff):
Definition
Supraspinatus, Infraspinatus, Teres Minor, Teres Major, Subscapularis, Deltoid
Term
Supraspinatus - Origin
Definition
Supraspinous fossa of the scapula
Term
Supraspinatus - Insertion
Definition
Greater tubercle of humerus
Term
Supraspinatus - Innervation
Definition
Suprascapular n.
Term
Supraspinatus - Blood Supply
Definition
Suprascapular a.
Term
Supraspinatus - Function
Definition
Abducts the arm... Important in 1st 15 degrees of movement
Term
Infraspinatus - Origin
Definition
Infraspinous fossa of scapula
Term
Infraspinatus - Insertion
Definition
Greater tubercle of humerus
Term
Infraspinatus - Innervation
Definition
Suprascapular n.
Term
Infraspinatus - Blood Supply
Definition
Suprascapular a.
Term
Infraspinatus - Function
Definition
Adducts the arm.. Laterally rotates arm
Term
Teres Minor - Origin
Definition
Scapula's lateral border
Term
Teres Minor - Insertion
Definition
Greater tubercle of humerus
Term
Teres Minor - Innervation
Definition
Axillary n.
Term
Teres Minor - Blood Supply
Definition
Circumflex scapular a. and Posterior Humeral Circumflex a.
Term
Teres Minor - Function
Definition
Adducts the arm... Laterally rotates the arm
Term
Teres Major - Origin
Definition
Scapula's inferior angle
Term
Teres Major - Insertion
Definition
Intertubercular (Bicipital) groove of humerus
Term
Teres Major - Innervation
Definition
Lower subscapular n.
Term
Teres Major - Blood Supply
Definition
Circumflex scapular and posterior humeral circumflex a.
Term
Teres Major - Function
Definition
Addcuts the arm.. Medially rotates the arm
Term
Subscapularis - Origin
Definition
Subscapular fossa of scapula
Term
Subscapularis - Insertion
Definition
Lesser tubercle of humerus
Term
Subscapularis - Innervation
Definition
Upper and lower subscapular nn.
Term
Subscapularis - Blood Supply
Definition
Subscapular a.
Term
Subscapularis - Function
Definition
Adducts the arm.. Medially rotates the arm
Term
Deltoid - Origin
Definition
Clavicle, acromion, spacular's spine
Term
Deltoid - Insertion
Definition
Deltoid tuberosity of humerus
Term
Deltoid - Innervation
Definition
Axillary n.
Term
Deltoid - Blood Supply
Definition
Posterior humeral circumflex a. and Thoracoacromial a. (deltoid branch)
Term
Deltoid - Function
Definition
Abducts beyond 15 degrees of movement... Flexes arm.. Extends Arm
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