{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

131%2C+T13%2C+Ch11+Muscles - Muscles Chapter 11 Arrangement...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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 brachii) (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
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
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 brachii) (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 brachii) (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 11 (c) Pharyngeal arch (branchiomeric) muscles: 4th–7th somitomeres Pharynx Muscles of facial expression e.g., orbicularis oculi Chewing muscles e.g., temporalis, masseter
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.
  • Spring '11
  • CARLOTOM
  • muscles, Muscles of the upper limb, Extensor Digitorum, Fibularis longus, Extensor digitorum Neck Epicranius, Posterior Muscles Crossing Elbow Joint

{[ snackBarMessage ]}