ANP 1106 Lecture 9: Muscular System pt 1 (muscles of face and thoracic region)

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Jackie Carnegie

Document Summary

Muscle fiber is a single muscle tissue cell; several different levels of ct wrapping: Endomysium fine layer of ct that surrounds each muscle fiber (cell) Epimysium dense, fibrous ct that surrounds and hold together a group of fascicles = outside layer of a single muscle. Deep fascia still coarser layer of dense ct that binds muscles into functional group i. e hamstrings vs quadriceps. Muscle attachments most muscle span joints and are attached to bones in at least 2 places. Origin: muscle attachment on bone that acts as anchor; insertion: muscle attachment on the bone that moves. Origin and insertion referrals depend on the type of movement (could be interchanged) Most attachments are indirect attachments involving either a tendon or an aponeurosis. Arrangement of fascicles all skeletal muscles have fascicles; 4 patterns: Parallel strap-like (sartorius) or fusiform (biceps brachii) Pennate (feather like) unipennate (extensor digitorum longus), bipennate (rectus femoris), multipennate (deltoid) Convergent muscle is triangular or fan-shaped (pectoralis major)