HSS 2511 Lecture Notes - Lecture 5: Atlanto-Axial Joint, Cervical Vertebrae, Tubercle

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Axis: has a vertebral body and all of the normal characteristics other than the dens, dens articulates with the anterior arc of the atlas to create the atlanto-axial joint and (cid:373)ake the (cid:862)(cid:374)o(cid:863) (cid:373)o(cid:448)e(cid:373)e(cid:374)t. Atlanto-occipital joint: between the head and atlas, concave and convex surfaces move, pri(cid:373)ar(cid:455) (cid:373)o(cid:448)e(cid:373)e(cid:374)t is fle(cid:454)io(cid:374) a(cid:374)d e(cid:454)te(cid:374)sio(cid:374) (cid:894)(cid:862)(cid:455)es(cid:863)(cid:895), lateral fle(cid:454)io(cid:374) is (cid:373)i(cid:374)i(cid:373)al. If people with damage to this ligament fall, they could die or be paralyzed. Apophyseal joint (c2-c7: 45-degree horizontal orientation, which allows for freedom of movement in the 3 anatomical planes. If you have tension in the cervical muscles, it will limit movement: cervical region is the most mobile and facilitates the movement of the head. Sterno-cleido-mastoid muscle: attaches to the sternum, clavicle and mastoid process, bilateral contractions: flexion or extension of the head/neck region, unilateral contraction: flexion of the same side and rotation of the opposite side of the head/neck region.

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