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Overview of skeletal muscles
Locations, origins and insertions of skeletal muscles
23
Anatomy
Undergraduate 1
03/31/2009

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Term
Temporalis
Definition
Muscle covering temporal, frontal and parietal bones. Origin - Temporal fossa, insertion - coronoid process of the mandible
Term
Masseter
Definition
Covers the lateral aspect of the mandibular ramus. Origin - Zygomatic arch and maxilla, insertion - angle and ramus of mandible
Term
Buccinator
Definition
Horizontal cheek muscle. Origin - Molar region of maxilla and mandible, insertion - orbicularis oris
Term
Sternocleidomastoid
Definition
Found in the neck. Origin - of the sternum and medial portion of the clavicle, insertion - mastoid process of the temporal bone and occipital bone
Term
Deltoid
Definition
Covers shoulder and upper arm. Origin - clavicle and scapula, insertion - deltiod tuberosity of the humerus. Common intramuscular injection site.
Term
Pectoralis Major
Definition
Found in upper chest. Orgin - Clavicle, sternum, cartilage of ribs 1-6. Insertion - via short tendon to the greater tubercule of the humerus
Term
Serratus Anterior
Definition
Found along side of ribs. Origin - Ribs 1-8, Insertion - Vertebral border of scapula
Term
External Obliques
Definition
Found on the anterior lateral abdomen. Origin - Outer surfaces of eight lower ribs, Insertion - pubic crest, pubic tubercle and illiac crest
Term
Rectus Abdominus
Definition
"Six-pack" section of abs. Origin - pubic crest and symphysis, insertion - Xiphoid process and costal cartilage of ribs 5-7
Term
Biceps Brachii
Definition
Origin - Coracoid process and glenoid cavity. Insertion - Radial tuberosity
Term
Brachialis
Definition
Found deep to biceps brachii on distal humerus. Origin - front of distal humerus, Insertion - Coronoid process of the ulna
Term
Triceps Brachii
Definition
Origins - Scapula, posterior shaft of humerus and posterior shaft of the humerus distal to the radial groove. Insertion - Olecranon process of the ulna
Term
Trapezius
Definition
Found in the upper back and neck. Origin - Occipital bone, spines of C7 and all thoraxic vertebrae. Insertion - Scapula and lateral third of the clavicle
Term
Latissimus Dorsi
Definition
Large, triangular muscle of lower back. Origin - Lower six thoraxic vertebrae, lumbar vertebrae, lower 3-4 ribs and illiac crest. Insertion - Intertubercular sulcus of the humerus
Term
Gluteus Maximus
Definition
Origin - Dorsal ilium, sacrum and coccyx. Insertion - Gluteal tuberosity of femur
Term
Gluteus Medius
Definition
Origin - Lateral surface of the illium. Insertion - Greater trochanter of femur. Common intramuscular injection site
Term
Gastrocnemius
Definition
With the soleus, forms the triceps surae. Origins - Medial and lateral condyles of the femur. Insertion - posterior calcaneus.
Term
Soleus
Definition
Forms the triceps surae with the gastrocnemius. Origin - Superior tibia and fibula. Insertion - posterrior calcaneus.
Term
Tibialis anterior
Definition
Origin - Lateral condyle and upper 2/3 of tibial shaft. Insertion - Medial cuneiform and first metatarsal
Term
Forearm flexors
Definition
Brachioradialis, flexor carpi radialis, palmaris longus and flexor carpi ulnaris
Term
Forearm extensors
Definition
Extensor carpi ulnaris, extensor digiti minimi, extensor digitorum and extensor carpi radialis brevis.
Term
Hamstrings
Definition
Biceps femoris, semitendonius, semimembranosus
Term
Quadriceps femoris
Definition
Vastus lateralis (intramuscular injection site), vastus intermedius, vastus medialis and rectus femoris
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