Chapter 7 (Lecture Objective 5) Flashcards

(13 cards)

1
Q

How is the skeletal system classified?

A

There are two portions of the skeletal system the axial and appendicular skeletons. Axial skull, vertebral column, thoracic cage. The appendicular is everything else.

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2
Q

What are the main features of the sphenoid bone?

A

Butterfly or bat-shape, structurally it has a central body and 3 pairs of processes (greater wings, lesser wings, pterygoid processes), and within the body it provides the spaces for the sphenoidal sinuses which make the skull lighter.

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3
Q

Name the bones that form the orbital foramen.

A

The three main function of the paranasal sinuses are to connect the sinuses to the nasal cavity, to lighten the skull, and enhance the resonance of the voice

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4
Q

What is the significance of the following structures: foramen magnum, foramen ovale, jugular foramen, sella turcica, optic canal, mastoid process, mental foramen, mandibular foramen, superior orbital fissure, dens and the cribriform plate?

A

Foramen magnum: inferior part of brain connect with spinal cord
Foramen ovale: provide passageways for branches of the cranial nerve V to reach the face
Jugular foramen: allow passage of internal jugular vein and 3 cranial nerves (IX, X, XI)
Sella turcica : bony seat for pituitary gland
Optic canal : allow optic nerves (cranial nerves II) to pass to the eyes
Mastoid process : anchoring site for some neck muscles
Mental foramen : allow blood vessels and nerves to pass to skin of chin
Mandibular foramen : permit nerves responsible for tooth sensation to pass to teeth in lower jaw
Superior orbital fissure : allows cranial nerves that control eye movements (III, IV, VI) to enter orbit
Dens : pivot for rotation of atlas
Cribriform plate : help form the roof of nasal cavity and floor of anterior cranial fossa

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5
Q

What are the regional characteristics of vertebrae?

A

Movements that can occur between vertebrae are flexion/extension, lateral flexion, rotation

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6
Q

What are the distinct features of the atlas and axis

A

The distinct features of the atlas and axis are : no intervertebral disc between them, the atlas has no body, no or spinous process, the axis has a structure called the dens projecting from body.

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7
Q

What are the functions of paranasal sinuses?

A

The three main function of the paranasal sinuses are to connect the sinuses to the nasal cavity, to lighten the skull, and enhance the resonance of the voice

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8
Q

What are floating ribs, false ribs and true ribs?

A

Floating ribs: no anterior attachments
False ribs: attach indirectly to sternum, or lack any sternal attachment
True: attach directly to sternum

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9
Q

What are the main differences between a male and female pelvis?

A

bone thickness - females thinner, pubic arch angle- females larger, acetabula- females small, sacrum - females wider and shorter, coccyx - females moveable and strait

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10
Q

What structural feature allows more mobility in the shoulder (relative to the hip)?

A

The shoulder has a shallow glenoid cavity which allows for a larger range of motion than the hip.

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11
Q

What are the main structures of the coxal bone?

A

The main structure os the coal bone are Ilium, pubis, ischium.

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12
Q

Which bones form the pelvic girdle?

A

The pelvic girdle is formed by the sacrum and hip bones.

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13
Q

Describe the general structure of an intervertebral disc

A

The general structure of a vertebral discs is : an inner gelatinous nucleus pulposus, which is surrounded by a strong collar mad of collagen fibers superficially and fibrocartilage internally, and the anulus fibrosis is the last barrier that serves to limit expansion of nucleus pulposus.

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