ANAT2111 Lecture Notes - Lecture 12: Orbicularis Oculi Muscle, Abdominal External Oblique Muscle, Orbicularis Oris Muscle

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

Document Summary

Muscles move or stabilise bones or other structures. Muscles can also attach to cartilage, fascia, organs e. g. eyeball or to skin. Tendons of some muscles (usually flat muscles) form flat sheets for their attachment such as tendons that are called aponeuroses of the external oblique muscle. Muscle cells are called muscle fibres, because they are long and narrow. Organised into fascicles (large enough to be seen). Different muscle fascicles are aligned in different patterns. Usually surround external body openings, close by contracting, thus acting as sphincters. E. g. facial muscles, orbicularis oculi and orbicularis oris. Origin of muscle is broad and fascicles converge to the insertion. Long axes of fascicles are parallel to the long axis of muscle. Form of fusiform e. g. biceps brachii muscle or straplike e. g. Form of fusiform e. g. biceps brachii muscle or straplike e. g. sartorius muscle. Fascicles are short, attach obliquely to tendon that runs the whole length of the muscle.