131%2C+T13%2C+Ch11+Muscles

131%2C+T13%2C+Ch11+Muscles - 9/30/11 Muscles Chapter 11...

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9/30/11 1 Muscles Chapter 11 IB 131 Instructor: Tom Carlson Department of Integrative Biology University of California, Berkeley 1 Arrangement of Fascicles in Muscles • Skeletal muscles—consist of fascicles Fascicles: bundles of muscle fibers • Fascicles are arranged in different patterns • Fascicle arrangement—determines action of a muscle 2 Circular Arrangement of Fascicles in Muscles • Fascicles are arranged in concentric rings • Surround external body openings • Sphincter—general name for circular muscle • Examples Orbicularis oris around mouth Orbicularis oculi around eye orbit 3 Corrugator supercilii Orbicularis oculi Levator labii superioris Zygomaticus minor and major Buccinator Risorius Orbicularis oris Mentalis Depressor labii inferioris Depressor anguli oris Platysma Galea aponeurotica Frontal belly Occipital belly Temporalis Masseter Sternocleidomastoid Trapezius Splenius capitis Epicranius Muscles of the Head—Facial Expression Figure 11.9 4 (f) Bipennate (rectus femoris) (a) (b) (c) (f) (g) (e) (d) (a) Circular (orbicularis oris) (b) Convergent (pectoralis major) (d) Parallel (sartorius) (c) Fusiform (biceps brachi ) (g) Unipennate (extensor digitorum longus) (e) Multipennate (deltoid) Arrangement of Fascicles in Muscles Figure 11.1 5 Convergent Arrangement of Fascicles in Muscles Convergent • Origin of the muscle is broad • Fascicles converge toward the tendon of insertion • Example—pectoralis major 6
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9/30/11 2 Parallel Arrangement of Fascicles in Muscles Parallel —fascicles run parallel to the long axis of the muscle • Strap-like—sartorius • Strap-like—sternocleidomastoid • Fusiform (with expanded central belly) —biceps brachii 7 (f) Bipennate (rectus femoris) (a) (b) (c) (f) (g) (e) (d) (a) Circular (orbicularis oris) (b) Convergent (pectoralis major) (d) Parallel (sartorius) (c) Fusiform (biceps brachi ) (g) Unipennate (extensor digitorum longus) (e) Multipennate (deltoid) Arrangement of Fascicles in Muscles Figure 11.1 8 Pennate Arrangement of Fascicles in Muscles Unipennate —fascicles insert into one side of the tendon (e.g. extensor digitorum longus) Bipennate —fascicles insert into the tendon from both sides (rectus femoris) Multipennate —fascicles insert into one large tendon from all sides (deltoid) 9 (f) Bipennate (rectus femoris) (a) (b) (c) (f) (g) (e) (d) (a) Circular (orbicularis oris) (b) Convergent (pectoralis major) (d) Parallel (sartorius) (c) Fusiform (biceps brachi ) (g) Unipennate (extensor digitorum longus) (e) Multipennate (deltoid) Arrangement of Fascicles in Muscles Figure 11.1 10 Muscle groups based on embryonic development Visceral organ muscles: smooth and cardiac muscle Pharyngeal arch muscles: skeletal muscles of the pharynx and some of head & neck Axial muscles: skeletal muscles of the thorax, abdomen, and pelvis plus many in the neck and a few in the head Limb muscles: skeletal muscles of upper and lower extremities
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This note was uploaded on 10/14/2011 for the course IB 131 taught by Professor Carlotom during the Spring '11 term at City College of San Francisco.

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131%2C+T13%2C+Ch11+Muscles - 9/30/11 Muscles Chapter 11...

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