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Spinal Anatomy (Mine) > Atypical Cervical Vertebrae: C1 > Flashcards

Atypical Cervical Vertebrae: C1 Flashcards

1
Q

What is the name of the first cervical vertebra?

A

Atlas

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2
Q

What features are lacking at C1?

A

vertebral body, pedicles, a spinous process and the intervertebral disc

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3
Q

What is thought to represent the pedicle at C1?

A

the anterior arch

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4
Q

What osseous modification is observed to the front of the anterior arch of C1?

A

the anterior tubricle

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5
Q

What muscle attaches to the anterior arch of C1?

A

longus colli

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6
Q

What ligaments will attach to the anterior arch of C1?

A

the anterior longitudinal, anterior atlanto-occipital and anterior atlanto-axial ligaments

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7
Q

What is observed on the back of the anterior arch of C1?

A

the fovea dentis

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8
Q

What joint classifications are observed on the anterior arch of C1?

A

fibrous (amphiarthrosis) syndesmosis joint and synovial pivot (diarthrosis trochoid) joint

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9
Q

what is the contribution of the lateral mass to the circumference of C1?

A

forty percent; twenty percent for each lateral mass

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10
Q

what is the morphology of the superior articular facet of C1?

A

they are elliptical, closer together in front and often demonstrate an elevation subdividing the facet surface into two separate surfaces

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11
Q

what is the orientation of the superior articular facet of C1?

A

backward, upward, medial (BUM)

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12
Q

what is the joint classification of the atlanto-occipital zygapophysis?

A

synovial (diarthrosis) ellipsodial joint

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13
Q

what are the morphological characteristics of the inferior articular facet of C1?

A

asymmetrical, slightly concave or flattened

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14
Q

What is the orientation of the inferior articular facet of C1?

A

backward, medial, downward (BMD)

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15
Q

what is the joint classification of the atlanto-axial zygapophysis?

A

synovial plane (diarthrosis arthrodia) joint

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16
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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17
Q

what muscles attach to the lateral mass of C1?

A

levator scapula, splenius cervicis and rectus capitis anterior

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18
Q

what is the contribution of the posterior arch to the circumference of C1?

A

about forty percent

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19
Q

what part of C1 represents the spinous process?

A

posterior tubercle of the posterior arch

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20
Q

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

A

males: about 50 mm
females: about 37 mm

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21
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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22
Q

what superior surface modifications of the posterior arch of C1 are present?

A

groove/sulcus for the vertebral artery and arcuate rim

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23
Q

what attaches to the arcuate rim of C1?

A

the posterior atlanto-occipital ligament

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24
Q

What are the attachment sites of the posterior atlanto-occipital ligament?

A

it is attached to the arcuate rim of the posterior arch of atlas, to the superior articular process of the lateral mass of atlas and to the posterior margin of the foramen magnum of the occipital bone

25
Q

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

A

accessory bone

26
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

27
Q

based on the amount of ossification of the anterior free margin of the posterior atlanto-ocipital ligament what structures will form?

A

an incomplete ponticulus posticus or a complete ponticulus posticus

28
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

29
Q

what forms the types of ponticulus posticus?

A

ossification of the anterior free margin of the posterior atlanto-occipital ligament

30
Q

what are the attachment sites of the ponticulus posticus?

A

it is attached to the arcuate rim of the posterior arch of atlas and to the superior articular process of the lateral mass of atlas

31
Q

what other name may be used to identifiy a ponticulus posticus?

A

Kimmerle’s anomaly

32
Q

what names are given to the opening formed by the ponticulus posicus?

A

arcuate foramen or retroarticular canal

33
Q

ponticulus posticus has observed in what ethnic populations?

A

all ethnic populations studied thus far

34
Q

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

A

1%-41%

35
Q

what is the gender bias now associated with ponticulus posticus?

A

female

36
Q

what is the incidence of a complete ponticulus posticus versus an incomplete ponticulus posticus?

A

the incidence of a complete ponticulus posticus is about 15%. the incidence of an incomplete ponticulus posticus may be as high as 41%

37
Q

what is observed on the undersurface of the posterior arch of C1?

A

inferior vertebral notch and an attachment site for the posterior atlanto-axial ligament

38
Q

what joint classification(s) may be observed on the posterior arch of C1?

A

fibrous (amphiarthrosis) syndesmosis joint

39
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

40
Q

what is the general appearance of the transverse process of C1?

A

triangular

41
Q

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

A

costal element, posterior tubercle, true transverse process

42
Q

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

A

anterior tubercle and costotransverse bar

43
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

44
Q

what suboccipital muscles are known to have fascial projections attaching to the spinal dura?

A

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

45
Q

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

A

myodural bridges

46
Q

what are the lateral bridges of atlas connected to?

A

the lateral mass and the transverse process of atlas

47
Q

what forms of the lateral bridges are observed in the population?

A

incomplete lateral bridges and complete lateral bridges

48
Q

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

A

the retrotransverse foramen

49
Q

what are the possible contents of the retrotransverse foramen?

A

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

50
Q

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

A

lateral bridges

51
Q

which of the ponticles (bridges) of atlas is most numerous?

A

ponticulus posticus

52
Q

what is observed in the transverse foramen of C1?

A

vertebral artery, vertebral venous plexus postganglionic sympathetic motor nerve fibers

53
Q

what is the gender variation for measurements of the transverse diameter of C1?

A

males: 78 mm
females: 72 mm

54
Q

is there a gender variation for the distance from the posterior tubercle of the transverse process of C1 to the skin?

A

not a significant difference

55
Q

what is the distance from the posterior tubercle of the transverse process of C1 to the skin for each gender?

A

a little over 30 mm for both males and females

56
Q

what joint classifications are oberved at C1?

A

fibrous (amphiarthrosis) syndesmosis joint, synovial (diarthrosis) ellipsoidal joint, synovial pivot (diarthrosis trochoid) joint and synovial plane (diarthrosis arthrodia) joint

57
Q

how many synovial joint surfaces are observed at C1?

A

five

58
Q

what synovial joint surfaces are observed at C1?

A

two superior articular facets, two inferior articular facets and the fovea dentis

Spinal Anatomy (Mine) (9 decks)

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