Flashcards in Quizzies (Atypical Cervical Vertebrae: C1/Atlas) Deck (42):
What is the name of the first cervical vertebra?
What features are lacking at C1?
Vertebral body, pedicle, a spinous process, and the intervertebral disc
What is thought to represent the pedicle at C1?
The anterior arch
What muscle attaches to the anterior arch of C1?
What ligaments will attach to the anterior arch of C1?
The anterior longitudinal, anterior atlanto-occipital, and anterior atlanto-axial ligaments
What is observed on the back of the anterior arch of C1?
The fovea dentis
What joint classifications are observed on the anterior arch of C1?
Fibrous (amphiarthrosis) syndesmosis joint and synovial pivot (diarthrosis trochoid) joint
What is the morphology of the superior articular facet of C1?
They are elliptical, closer together in front, and often demonstrate an elevation subdividing the facet surface into two separate surfaces
What is the orientation of the superior articular facet of C1?
Backward, upward, medial (BUM)
What is the joint classification of the atlanto-occipital zygapophysis?
Synovial (diarthrosis) ellipsoidal joint
What are the morphological characteristics of the inferior articular facet of C1?
Asymmetrical, slightly concave or flattened
What is the orientation of the inferior articular facet of C1?
Backward, medial and downward (BMD)
What is the name of the rounded elevation on the medial aspect of the lateral mass of C1?
Tubercle for the transverse atlantal ligament
What muscles attach to the lateral mass of C1?
Levator scapula, splenius cervicis, and rectus capitus anterior
What part of C1 represents the spinous process?
Posterior tubercle of the posterior arch
What is the distance from the posterior tubercle of the posterior arch to the skin in each gender?
Males: about fifty millimeters; females: about thirty-seven millimeters
What attaches to the posterior tubercle of the posterior arch of C1?
Rectus capitis posterior minor muscle and ligamentum nuchae
What superior surface modifications of the posterior arch of C1 are present?
Groove/sulcus for the vertebral artery and arcuate rim
What attaches to the arcuate rim of C1?
The posterior atlanto-occipital ligament
What is the earliest age of development where ossification of the anterior free margin of the posterior atlanto-occipital ligament was observed?
About age 7 years old
Based on the amount of ossification of the anterior free margin of the posterior atlanto-occipital ligament what structures will form?
An incomplete ponticulus posticus or a complete ponticulus posticus
What forms the types of ponticulus posticus?
Ossification of the anterior free margin of the posterior atlanto-occipital ligament
What are the attachment sites of the ponticulus posticus?
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
What other name may be used to identify a ponticulus posticus?
What names are given to the opening formed by the ponticulus posticus?
Arcuate foramen or retroarticular canal
Ponticulus posticus has been observed in what ethnic populations?
All ethnic populations studied thus far
What is the gender bias now associated with ponticulus posticus?
What are the osseous parts of the transverse process of C1?
Costal element, posterior tubercle, true transverse process
What osseous parts of the transverse process are absent at C1?
Anterior tubercle and costotransverse bar
What muscles attach to the transverse process of C1?
Rectus capitis anterior, rectus capitis lateralis, middle scalene, levator scapula, splenius cervicis, obliquus capitis superior, obliquus capitis inferior, and intertransversarii muscles
What suboccipital muscles are known to have facial projections attaching to the spinal dura?
Rectus capitis posterior minor, rectus capitis posterior major, obliquus capitis inferior
What are the connections between suboccipital muscles and the spinal dural called?
What are the lateral bridges of atlas connected to?
The lateral mass and the transverse process of atlas
What opening is identified when a complete lateral bridge is formed?
The retrotransverse foramen
What are the possible contents of the retrotransverse foramen?
The vertebral artery, a branch from the suboccipital nerve, and veins communicating with the venous sinuses of the neck
Which of the ponticles (bridges) of atlas is most numerous?
Which of the ponticles (bridges) of atlas is only observed in humans?
What is the gender variation for measurements of the transverse diameter of C1?
Males: 78 millimeters and females: 72 millimeters
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
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
How many synovial joint surfaces are observed at C1?