BIO210Y5 Lecture 7: Lec 7 (4B)- Sept 27
Notes
Review:
● Slide (15-19 4A)
○ TMJ (Temporomandibular Joint)
■ Is a gliding and hinge joint
■ The jaw can rotate, angular motion, gliding
■ Variable degrees of freedom
■ 4 types of Motion
● Retraction
○ Pushing mandible behind the maxilla
○ Posterior gliding motion
● Protraction
○ Push mandible in front of maxilla
○ Anterior gliding motion
● Depression
○ Opening your mouth
● Elevation
○ Closing your mouth
○ AOJ (Atlanto Occipital joint)
■ Joint that attaches skull with the rest of body
■ Conjunction of the occipital condyle with the skull
■ Two degrees of freedom
● Biaxial joint
○ Convex
○ Concave
● You could 2 movements
○ Angular Motion
○ Rotation
● Motions
○ Lateral
■ Angular motion to right or left
○ Rotation to left or flext
○ Flexion
■ Anterior angular motion
■ Laterally flexing your head so that it is no longer
180 degree with the rest of body
○ Extension
■ Posterior angular motion
■ Returning from flexion back to 180 or normal with
the rest of the body
○ Anatomical position
■ hyperextension
Document Summary
The jaw can rotate, angular motion, gliding. Joint that attaches skull with the rest of body. Conjunction of the occipital condyle with the skull. Laterally flexing your head so that it is no longer. Returning from flexion back to 180 or normal with the rest of the body. Facial muscles (i - represents insertion, o-origin points) It is on the skin and fascia of lips (i) It must be anchored on the maxillary bone (o) It is on the skin of upper lip (i) The muscle is a flat piece, plate. The origin or anchoring point is the superior thorax (pectoral fascia) It is on the inferior mandible & skin of the cheek. Insertion is movable element, load that needs to be moved through applied force. Insertion moves toward the origin in whatever direction. It is on the ramus & coronoid process of mandible. It is on the mandibular ramus & angle.
