Ch. 8 Axial Skeleton Flashcards

1
Q

Axial skeleton (3)

A
  • 80 bones that make up midline of the body
  • support and protect the organs of the head, neck, chest, and pelvis
  • provide attachment sites for the muscles that move the head, neck, and trunk
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2
Q

Appendicular skeleton (2)

A
  • 126 bones that make up the extremities

- attach the extremities to the trunk

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3
Q

Bones of the axial skeleton (4)

A
  • skull (cranium and facial bones)
  • hyoid bone
  • vertebral column (cervical, thoracic, and lumbar vertebrae, scrum, and coccyx)
  • rib cage (sternum and ribs)
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4
Q

Cranium bones

A

house and protect the brain

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5
Q

Facial bones

A

attachment sites for the muscles of chewing and facial expressions

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6
Q

Hyoid bone

A
  • does not articulate with any other bones of the skeleton

- attachment site for the muscles of the tongue and throat

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7
Q

Paranasal sinuses (4)

A
  • air-filled cavities within frontal bone, sphenoid bone, ethmoid bone, and maxillary bone
  • lined by mucous membrane
  • connect directly with nasal cavity
  • echo chambers in the production of speech
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8
Q

Vertebral column (5)

A
  • vertical series of bones stacked on each other
  • protects the spinal cord
  • serves as an attachment site for the back muscles
  • superior end: articulates with occipital bone
  • distal end: sacrum articulates with pelvic bones
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9
Q

Cervical vertebrae (2)

A
  • 7 vertebrae

- form neck region

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10
Q

Atlas (C1) (3)

A
  • 1st cervical vertebra
  • articulates with occipital condyles of the skull
  • allows up and down movement of the skull
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11
Q

Axis (C2) (2)

A
  • 2nd cervical vertebra

- allows left and right rotation of the atlas and skull

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12
Q

Thoracic vertebrae (3)

A
  • 12 vertebrae
  • form chest region
  • articulate with the ribs to form rib cage
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13
Q

Intervertebral disc (2)

A
  • composed of fibrocartilage

- shock absorber between vertebrae

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14
Q

Lumbar vertebrae (2)

A
  • 5 vertebrae

- form the lower back region

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15
Q

Sacrum (2)

A
  • 5 fused vertebrae

- articulates with pelvic bones to form pelvic girdle

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16
Q

Coccyx (3)

A
  • 3-4 rudimentary vertebrae
  • fused together
  • also called tailbone
17
Q

Pedicle of vertebra (2)

A
  • anterior portion of vertebral arch

- between body and transverse process

18
Q

Lamina of vertebra (2)

A
  • posterior portion of vertebral arch

- between spinous process and transverse process

19
Q

Vertebral arch (2)

A
  • “sides” of the vertebra

- formed by fusion of pedicle and lamina

20
Q

Spinous process of vertebra (3)

A
  • single posterior projection
  • backbone of vertebrae
  • attachment point for tendons and ligaments
21
Q

Body of vertebra (3)

A
  • centrally located
  • round in outline
  • site of attachment of intervertebral discs
22
Q

Vertebral foramen (2)

A
  • opening formed by body and vertebral arch

- houses spinal cord

23
Q

Transverse process (2)

A
  • each vertebra has a left and right lateral projection

- attachment point for tendons and ligaments

24
Q

Superior articular facet (2)

A
  • each vertebra has a left and right facet

- articulates with inferior articular facet of vertebra above it

25
Q

Superior costal facet (thoracic vertebra) (2)

A
  • superior lateral side of body

- articulates with head of ribs

26
Q

Transverse costal facet (thoracic vertebra) (2)

A
  • transverse process

- articulates with tubercle of ribs

27
Q

Inferior costal facet (thoracic vertebra) (2)

A
  • inferior lateral side of the body

- articles with head of ribs

28
Q

Intervertebral notch (lumbar vertebra) (3)

A
  • found on all vertebrae
  • below pedicle
  • nerves and blood vessels to and from spinal cord pass through these spaces
29
Q

Inferior articular facet (lumbar vertebra) (2)

A
  • found on all vertebrae

- articulates with superior facet of the vertebra below it

30
Q

Rib cage bones

A

articulate with one another to form a flexible, protective cage around the organs of the thoracic cavity

31
Q

Rib cage structures (4)

A
  • thoracic vertebrae
  • ribs
  • sternum
  • costal cartilages
32
Q

Ribs 1-7 (2)

A
  • connect to sternum via costal cartilages

- true ribs or vertebrosternal ribs

33
Q

Ribs 8-10 (2)

A
  • connect to sternum via shared cartilage

- false ribs

34
Q

Ribs 11-12 (3)

A
  • do not connect to sternum
  • part of false ribs
  • floating ribs
35
Q

Sternum (3)

A
  • flat bone
  • forms interior midline of the rib cage
  • breast bone
36
Q

Fetal skull (2)

A
  • flexible connective tissue

- fontanelles: anterior, posterior, mastoid, and sphenoidal

37
Q

Fontanelles (2)

A
  • where multiple bones meet

- largest areas of connective tissue