Shared Flashcard Set

Details

Axial Skeleton
Structures of the Axial Skeleton
82
Biology
Undergraduate 1
10/08/2014

Additional Biology Flashcards

 


 

Cards

Term
Central Canal (Haversian Canal)
Definition

runs parallel to the long axis of the bone and carries blood vessels, nerves, and lymphatic vessels through the bone matrix.

[image]

 

 

Term
Osteocytes
Definition
Mature bones cells[image]
Term
Lacune
Definition
The chambers in the osteocytes[image]
Term
Concentric Lamellae
Definition
Concentric circles around the central canal[image]
Term
Interstitial lamellae
Definition
Remnants of circumferential lamellae that have been broken down. In between concentric lamellae to keep osteocytes packed in together.[image]
Term
Osteon (Haversian system)
Definition
A central canal and all the concentric lamellae surrounding it[image]
Term
Canaliculi
Definition
Tiny canals radiating outward from a central canal to the lacunae of the first lamella and then from lamella to lamella.[image]
Term
Perforating Canals (Volkmann's Canals)
Definition
Canals that run at right angles to the shaft and complete the communication pathway between the bone interior and its extrenal surface.[image]
Term
Cranium
Definition
Bones of the skull that enclose and protect the fragile brain tissue
Term
Facial bones
Definition
Bones of the skull that support the eyes and position them anteriorly. They also provide attatchment for facial muscles.
Term
Frontal Bone
Definition
Anterior portion of the cranium; forms the forehead, superior part of the orbit, and the floor of anterior cranial fossa.[image]
Term
Supraorbital Foramen (notch)
Definition
Opening above each orbit allowing blood vessels and nerves to pass.[image]
Term
Glabella
Definition
Smooth area between the eyes[image]
Term
Sagittal Suture
Definition
Midline articulation point of the two parietal bones[image]
Term
Coronal Suture
Definition
Point of articulation of parietals with frontal bone[image]
Term
Temporal Bone
Definition
Inferior to the parietal bone on lateral skull (temples)[image]
Term
Squamous suture
Definition

Point of articulation of the temporal bone with the parietal bone.

[image]

Term
Zygomatic Process
Definition
A bridgelike projection joining the zygomatic bone (cheekbone) anteriorly.[image]
Term
Mandibular Fossa
Definition
Rounded depression on the inferior surface of the face of the zygomatic process (anterior to the ear); forms the socket for the condylar process of the mandible, where the mandible (lower jaw) joins the cranium.[image]
Term
External Acoustic meatus
Definition
Canal leading to eardrum and middle ear[image]
Term
Styloid Process
Definition

Stylo = stake, pointed object

Needle-like projection inferior to external acoustic meatus; attatchment point for muscles and ligaments of the neck.[image]

Term
Mastoid Process
Definition
Rough projection inferior and posterior external acoustic meatus; attatchment site for muscles[image]
Term
Occipital Bone
Definition
Most posterior bone of the cranium--forms floor and back wall. Joins sphenoid bone anteriorly via its narrow basilar part.[image]
Term
Lambdoid suture
Definition
Site of articulation of occipital bone and parietal bones.[image]
Term
Foramen Magnum
Definition
Large opening in base of occipital, which allows the spinal cord to join with the brain.
Term
Occipital Condyles
Definition

Rounded projections lateral to the foramen magnum that articulate with the first cervical vertebrae (atlas).

[image]

Term
Spheniod Bone
Definition

Bat-shaped bone forming the anterior plateau of the middle cranial fossa across the width of the skull. It is the keystone of the cranium because it articulates with all other cranial bones.

[image]

Term
Greater wings
Definition
Larger portions of the spheniod seen exteriorly anterior to the temporal and forming part of the eye orbits.
Term
Lesser Wings
Definition
Smaller portions of the spheniod anterior to the sella turcica (turk's saddle).
Term
Sella Turcica (Turk's Saddle)
Definition
A saddle-shapped region in the spheniod midline. The seat of the saddle, called the hysphenoid midline, surrounds the pituitary gland.
Term
Ethmoid Bone
Definition

Irregularly shaped bone anterior to the sphenoid. Forms the roof of the nasal cavity, upper nasal septum, and part of the medial orbit walls

[image]

Term
Mandible
Definition
The lower jawbone, which articulates with the temporal bones in the freely movable joints of the skull.
Term
Mandibular body
Definition

Horizontal portion; forms the chin

[image]

Term
Mandibular Ramus
Definition

Vertical extension of the body on either side

[image]

Term
Condylar Process
Definition

Articulation point of the mandible with the mandibular fossa of the temporal bone

[image]

Term
Coronoid Process
Definition

Jutting anterior portion of the mandibular ramus; site of muscle attacthment

[image]

Term
Mental Foramen
Definition

Prominent opening on the body (lateral to the midline) that transmits the mental blood vessels and nerve to the lower jaw.

[image]

Term
Alveolar Process (mandible)
Definition

Superior margin of mandilble; contains sockets in which the teeth lie.

[image]

Term
Mandibular Symphysis
Definition

Anterior median depression indicating point of mandibular fusion

[image]

Term
Maxillae
Definition

Two bones fused in a median suture; form the upper jawbone and part of the orbits. All facial bones, except the mandible, join the this. Thus, they are the main, or keystone bones of the face.

 

Term
Aveolar Process (maxillae)
Definition

Inferior margin containing sockets in which the teeth lie

[image]

Term
Palatine Processes
Definition

Form the anterior hard palate; meet medially in the intermaxillary suture.

[image]

Term
Infraorbital Foramen
Definition

Opening under the orbit carrying the infraorbital nerves and blood vessels to the nasal region.

[image]

Term
Lacrimal Bone
Definition

Fingernail sized bones formin a part of the medial orbit walls between the maxillae and the ethmoid. Each bone is pierced by an opening (lacrimal fossa) which serves as a passageway for tears.

[image]

Term
Palatine Bone
Definition

Paired bones posterior to the palatine processes; for posterior hard palate and part of the orbit; meet medially at the median palatine suture.

[image]

Term
Zygomatic Bone
Definition

Lateral to the Maxillae; forms the portion of the face commonly called the cheekbone, and forms part of the lateral orbit. Its three processes are named for the bones with which they articulate.

[image]

Term
Nasal Bone
Definition

Small rectangular bones forming the bridge of the nose.

[image]

Term
Vomer
Definition

Vomer= plow

Blade shaped bone in median plane of the nasal cavity that forms the posterior and inferior nasal septum

[image]

Term
Inferior Nasal Conchae (Turbinates)
Definition

Thin curved bones protruding medially from the lateral walls of the nasal cavity; serve the same purpose as the turbiante portions of teh ethmoid bone.

[image]

Term
What four bones contain the sinuses?
Definition
Maxillary, spheniod, ethmoid, and frontal
Term
Hyoid bone
Definition

Bone in the throat above the larynx. Serves as a point of attatchment or many tongue and neck muscles. it does not articulate with any other bone and is thus unique.

[image]

Term
Vertebral Column
Definition
Extending from the skull to the pelvis, forms the body's major axial support. Additionally it surrounds and protects the delicate spinal cord while allowing the spinal nerves to emerge from the cord via openings between adjacent vertebrae.
Term
Vertebrae
Definition
24 of these bones create the vertebral column and are connected in a way as to provide a flexible curved structure.
Term
Vertebral Arch
Definition

Composed of pedicles and laminae, and a spinous process, it represents the junction of all posterior extensions from the vertebral body

[image]

Term
Body (or centrum):
Definition

Rounded central portion of the vertebrae, which faces anteriorly in the human vertebral column.

[image]

Term
Vertebral Foramen (spinal foramen)
Definition
Opening enclosed by the body and vertabral arch; a passageway for the spinal cord.
Term
Transerse processes
Definition

Two lateral projections from the vertebral arch

[image]

Term
Spinous Process
Definition

Single medial and posterior projections from the vertebral arch

[image]

Term
Superior and Inferior Articular Processes
Definition

Paired projections lateral to the vertebral foramen that enable articulation processes typically face toward the spinous process (posteriourly), whereas the inferior articular processes face (anteriorly) away from the spinous process.

Top and bottom nobs (condyles) of the vertebrae that allow each to sit on each other properly.

[image]

Term
Intervertebral Foramina
Definition

Notches in the right and left pedicles on the inferior and superior surfaces that create opeings for spinal nerves to leave the spinal cord between adjacent vertebrae.

[image]

Term
Cervical Vertebrae
Definition

Form the neck portion of the vertebral column

 

7

 

[image]

Term
Atlas
Definition

C1

First vertebrae; highly modified to perform special functions. It lacks a body, and its lateral processes contain large concave depressions on their superior surfaces that recieve the occipital condyles of the skull (enabling you to nod).

[image]

Term
Axis
Definition

C2

Second vertebrae; modified to perform special functions. It acts as a pivot for the rotation of the atlas (and skull).

[image]

Term
Dens (Onontoid Process)
Definition

Serves as a pivot point on the axis vertebrae. It articulates C1 and C2, allowing you to rotate your head from side to side (King tut's was fused).

 

Term
Thoracic Vertebrae
Definition

The chest portion of the vertebrae

 

12

 [image]

Term
Lumbar Vertebrae
Definition

Lower Back part of spine

 

5

[image]

Term
Sacrum
Definition

Composite bone formed from the fusion of five vertebrae. It articulates superiorly with L5 and inferiorly with the coccyx.

[image]

Term
Coccyx
Definition

Formed form the fusion of three to five small irregularly shaped vertebrae. It is the human tailbone. It is attached to the sacrum by ligaments

[image]

Term
Thoracic Cage
Definition

Consists of the bony thorax, which is composed of the sternum, ribs, and thoracic vertebrae, plus the costal cartilages. It protects the organs of the thoracic cavity.

[image]

Term
Sternum
Definition

Typical flat bone, a result of the fusion of 3 bones. It is attatched to the first 7 pairs of ribs.

[image]

Term
Manubrium
Definition
Looks like the knot of a tie; it articulates with the clavical laterally. Top portion of the sternum[image]
Term
Body (sternum)
Definition

Forms the bulk of the sternum. Looks like the long part of the tie

[image]

Term
Xiphoid Process
Definition

Constructs the inferior end of the sternum and lies at the level of the fifth intercostal space. It is made of hyaline cartilage in children but ossifies in adulthood.

[image]

Term
How many pairs of ribs are there?
Definition
12
Term
Where do the heads of the ribs connect?
Definition

Anteriorly on the vertebral column (via their tubercles). They then curve downward and toward the anterior body surface. 

 

Term
Vertebrosternal Ribs
Definition
The first seven pairs that attatch directly to the sternum via cartilage; "true" ribs
Term
Vertebrochondral Ribs
Definition
Rib pairs 8-10 that attatch to the ribcage via the costal cartilage of rib pair 7
Term
False Ribs
Definition
Inferior 5 rib pairs that do not attatch directly to the sternum
Term
Vertebral Ribs (floating ribs)
Definition
Last 2 pairs of ribs that do not attatch at all to the sternum but rather "float"
Term
Fontanelles
Definition

Fibrous membranes connecting the skull bones at birth; a baby's "soft spot"

[image]

Term
Pedicles
Definition

Stub of bone that connects the lamina to the vertebral body to create the vertebral arch.

[image]

Term
Lamina
Definition

Part of the vertebrae that connects to the spinous process.

[image]

Supporting users have an ad free experience!