ANAT2111 Lecture Notes - Lecture 13: Zygomatic Bone, Occipital Bone, Mastoid Part Of The Temporal Bone

• School: UNSW, UNSW Sydney
• Department: Anatomy
• Course: ANAT2111
• Professor: Dr Lawrence Wade

Document Summary

Masseter: o = zygomatic bone, i = angle of mandible. Predominantly vertical fibres and elevates the mandible. Temporalis: o = temporal fossa, i = coronoid process. More posterior fibres (almost horizontal) retracting the jaw. Muscles of the head and neck - sternocleidomastoid. O = manubrium, i = mastoid process, nuchal line of the occipital. 3 parallel columns extending from pelvis to the skull. Agonist of back extension (erect position / posture). Function: flex trunk and compress abdomen: rectus abdominis. Segmented by tendon intersections: external oblique (superficial) Fibres run downwards and medially: internal oblique (intermediate) Fibres run superiorly and medially: transverse abdominis (deep) Pectoralis major - ul to thoracic wall. O = sternal end of clavicle, sternum and ribs. Anterior = flex, middle = abduction, posterior = extension. O = lower thoracic vertebrae, iliac crest, sacrum. O = occipital bone, cervical and thoracic vertebrae.