Anatomy and Cell Biology 3319 Lecture 19: Anatomy and Cell Biology 3319 2nd Quarter Notes

• School: Western University
• Department: Anatomy and Cell Biology
• Course: Anatomy and Cell Biology 3319
• Professor: David Cechetto

Document Summary

Acb lecture 19 (8) intro to the muscular system: muscles of the head. Muscle structure and terminology: more(cid:9)than(cid:9)700(cid:9)muscles(cid:9)in(cid:9)the(cid:9)body,(cid:9)variety(cid:9)of(cid:9)shapes(cid:9)and(cid:9)sizes(cid:9)related(cid:9)to(cid:9)function, example:(cid:9)(cid:9)arrangement(cid:9)of(cid:9)the(cid:9)fascicles, circular, convergent, parallel, unipenate, bipenate, multipenate, muscle(cid:9)terminology. Synergist: names(cid:9)of(cid:9)muscles(cid:9)always(cid:9)tell(cid:9)you(cid:9)something(cid:9)about(cid:9, action(cid:9)or, microscopic view of muscle. If you let go of one of the reins, horses head will turn to the direction where you have the extra pull: have to have good balance b/w agonist and antagonist, otherwise will have an. Eye: corrugator supercilii, levator labi superioris, zygomaticus (major(cid:9)and(cid:9)minor, risorius, orbicularis oris, depressor(cid:9)labii inferioris. Neck: origin (on one bone) and insertion (ending in a tendon and attaching to another bone, muscles of facial expression don"t follow this pattern. Muscles(cid:9)of(cid:9)facial(cid:9)expression: sphincters(cid:9)/(cid:9) dilators(cid:9)around(cid:9) orifices(cid:9)of(cid:9)face, sphincter:(cid:9) arranged(cid:9)circularly, dilator:(cid:9)arranged(cid:9) radially, one(cid:9)end(cid:9)of(cid:9)muscle(cid:9) attached(cid:9)to(cid:9)bone,(cid:9) other(cid:9)intermingles(cid:9) with(cid:9)other(cid:9)muscles(cid:9) or(cid:9)inserts(cid:9)to(cid:9)skin. Some muscles act as sphincters or dilators around the diff openings of the face: sphincters around eye and mouth, are circularly arranged, dilators: muscles that act to open those structures up, more radially arranged.