BIOB33H3 Lecture Notes - Lecture 6: Calcaneus, Scalene Muscles, Pectoralis Minor Muscle
Document Summary
The muscular system: axial musculature (based on chapter 8, 9 and 10) Introduction: the skeletal muscle of the body can be subdivided into, axial musculature, muscles that position the head and vertebral column, muscles that move the rib cage, appendicular musculature, muscles that stabilize or move the appendicular skeleton. Masseter elevates mandible and closes jaws, assists in protracting and retracting mandible and moving mandible from side to side (origin zygomatic arch of zygomatic bone; insertion mandible) Temporalis elevates mandible and closes jaws, assists in retracting and moving mandible from side to side (origin along temporal ljnes of skull; insertion mandible) Medial pterygoid elevates the mandible and closes the jaw, or moves the mandible side to side (origin palatine bone, maxilla; insertion mandible) Digastric depresses mandible, opening mouth, and/or elevates larynx (origin mandible and temporal bone; insertion hyoid bone) Sternohyoid depresses hyoid bone and larynx (origin sternum; insertion hyoid bone)
