Day 16 (C1/Atlas) Flashcards

1
Q

What is thought to represent the pedicle at C1?

A

the anterior arch

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2
Q

What is the name of the rounded elevation on the medial aspect of the lateral mass of C1?

A

tubercle for the transverse atlantal ligament

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3
Q

What is the distance from the posterior tubercle of the posterior arch to the skin in each gender?

A

males: about fifty millimeters;
females: about thirty-seven millimeters

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4
Q

What attaches to the posterior tubercle of the posterior arch of C1?

A

rectus capitis posterior minor muscle and ligamentum nuchae

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5
Q

What attaches to the arcuate rim of C1?

A

the posterior atlanto-occipital ligament

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6
Q

Ossification of the free margin of the posterior atlanto-occipital ligament results in which atypical bone classification?

A

accessory bone

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7
Q

What is the earliest age of development where ossification of the anterior free margin of the posterior atlanto-occipital ligament was observed?

A

about age 7 years old

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8
Q

What may be formed by ossification of the anterior free margin of the posterior atlanto-occipital ligament?

A

a partial ponticulus posticus or complete ponticulus posticus

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9
Q

What other name may be used to identify a ponticulus posticus?

A

Kimmerle’s anomaly

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10
Q

What names are given to the opening formed by the ponticulus posticus?

A

arcuate foramen or retroarticular canal

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11
Q

Ponticulus posticus has observed in what ethnic populations?

A

all ethnic populations studied thus far

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12
Q

What is the general range of incidence of ponticulus posticus in the populations studied?

A

1% - 4%

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13
Q

What is the gender bias now associated with ponticulus posticus?

A

female

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14
Q

What is the location of the “zygapophysis” relative to the atlanto-occipital and atlanto-axial intervertebral foramina?

A

it forms part of the anterior boundary of the intervertebral foramen in both cases

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15
Q

What are the osseous parts of the transverse process of C1?

A

costal element, posterior tubercle, true transverse process

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16
Q

What osseous parts of the transverse process are absent at C1?

A

anterior tubercle and costotransverse bar

17
Q

What muscles attach to the transverse process of C1?

A

rectus capitis anterior, rectus capitis lateralis, middle scalene, levator scapula, splenius cervicis, obliquus capitis superior, obliquus capitis inferior and intertransversarii muscles

18
Q

What suboccipital muscles are known to have fasical projections attaching to the spinal dura?

A

rectus capitis posterior minor, rectus capitus posterior major, obliquus capitis inferior

19
Q

What are the connections between suboccipital muscles and the spinal dura called?

A

myodural bridges

20
Q

What are the lateral bridges of atlas connected to?

A

the lateral mass and the transverse process of atlas

21
Q

What opening is identified when a complete lateral bridge is formed?

A

the retrotransverse foramen

22
Q

What are the possible contents of the retrotransverse foramen?

A

the vertebal artery, a branch from the suboccipital nerve and veins communicating with the venous sinuses of the neck

23
Q

Which of the ponticles (bridges) of atlas is only observed in humans?

A

lateral bridges

24
Q

What is observed in the transverse foramen of C1?

A

vertebral artery, vertebral venous plexus, postganglionic sympathetic motor nerve fibers

25
What is the gender variation for measurements of the transverse diameter of C1?
males: 78 millimeters and females: 72 millimeters
26
What is the distance from the posterior tubercle of the transverse process of C1 to the skin for each gender?
a little over 30 millimeters for both males and females
27
What joint classifications are observed at C1?
fibrous (amphiarthrosis) syndesmosis joint, synovial (diarthrosis) ellipsoidal joint, synovial pivot (diarthrosis trochoid) joint and synovial plane (diarthrosis arthrodia) joint
28
How many synovial joint surfaces are observed at C1?
five
29
What synovial joint surfaces are observed at C1?
two superior articular facets, two inferior articular facets and the fovea dentis