IB131_9.21.09_Muscles - 600Humanskeletalmuscles

Info iconThis preview shows pages 1–15. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

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

View Full DocumentRight Arrow Icon
± 600 Human skeletal muscles ± General structural & functional topics muscle shape & function coordinated actions of muscle groups intrinsic & extrinsic muscles muscle innervation ± Regional descriptions
Background image of page 2
± eletal muscles nsist of fascicles Skeletal muscles consist of fascicles Fascicles –arranged in different patterns scicle arrangement lls about action of a Fascicle arrangement – tells about action of a muscle
Background image of page 3

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

View Full DocumentRight Arrow Icon
± Fusiform thick in middle & tapered at ends biceps brachii ± Parallel – fascicles run parallel to the long axis of muscle Rectus abdominis Strap like – sternocleidomastoid ± ircular scicles e arranged in concentric rings Circular fascicles are arranged in concentric rings Surround external body openings Sphincter – general name for a circular muscle amples Examples Orbicularis oris & orbicularis oculi
Background image of page 4
± Convergent Origin of the muscle is broad Fascicles converge toward the tendon of insertion ample – ectoralis ajor Example pectoralis major ± Pennate Fascicles insert obliquely on a tendon Unipennate – fascicles insert into one side of the tendon Bipennate – fascicles insert into the tendon from both sides Multipennate – fascicles insert into one large tendon from all sides palmar interosseus, rectus femoris & deltoid
Background image of page 5

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

View Full DocumentRight Arrow Icon
Background image of page 6
rigin ± Origin attachment to stationary end f muscle of muscle ± Belly thicker, middle region of muscle ± Insertion attachment to mobile end of muscle
Background image of page 7

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

View Full DocumentRight Arrow Icon
± muscle cannot reverse the movement it A muscle cannot reverse the movement it produces nother muscle must undo the action ± Another muscle must undo the action ± Muscles with opposite actions lie on opposite sides of a joint
Background image of page 8
± Prime mover (agonist) as major responsibility for a certain ovement Has major responsibility for a certain movement Produces most force ntagonist ± Antagonist Opposes or reverses a movement/ prime mover preventing excessive movement and injury ± Synergist –helps the prime mover Adding extra force undesirable movements/ modifying direction Stabilizing nearby joint Fixator A type of synergist that holds a bone firmly in place
Background image of page 9

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

View Full DocumentRight Arrow Icon
± Prime mover (agonist) = brachialis ± Antagonist = triceps brachii ± Synergist = biceps brachii Fixator = muscle that holds scapula firmly in place h b id Rhomboideus ms.
Background image of page 10
± ense fibrous connective tissue divides limb Dense fibrous connective tissue divides limb muscles into compartments ± Muscles in opposing compartments are Agonist and antagonist pairs ± Each compartment is innervated by a single nerve
Background image of page 11

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

View Full DocumentRight Arrow Icon
± The upper limb has terior posterior anterior & posterior compartments Anterior arm compartment muscles Flex the shoulder or arm Innervation is the musculocutaneous nerve Anterior forearm compartment muscles Flex the wrist and digits Innervation is the median or ulnar nerve
Background image of page 12
Figure 11.5b
Background image of page 13

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

View Full DocumentRight Arrow Icon
rural uscles are separated into 3 compartments ± Crural muscles are separated into 3 compartments.
Background image of page 14
Image of page 15
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/29/2009 for the course INTEG BIO 131 taught by Professor Lewis during the Fall '09 term at University of California, Berkeley.

Page1 / 89

IB131_9.21.09_Muscles - 600Humanskeletalmuscles

This preview shows document pages 1 - 15. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online