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Muscular System Notes

by: kgrunwaldt

Muscular System Notes BIOL 214

Marketplace > Truman State University > Science > BIOL 214 > Muscular System Notes
Truman State
GPA 3.92
Anatomy and Physiology I
Dr. Guffey

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3 pages of notes over the muscular system.
Anatomy and Physiology I
Dr. Guffey
Class Notes
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This 3 page Class Notes was uploaded by kgrunwaldt on Monday January 25, 2016. The Class Notes belongs to BIOL 214 at Truman State University taught by Dr. Guffey in Spring 2016. Since its upload, it has received 11 views. For similar materials see Anatomy and Physiology I in Science at Truman State University.

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Date Created: 01/25/16
Muscular System Interactions of the Skeletal Muscles in the Bodv Prime moveragonist the muscle that has the major responsibility for producing a specific movement 0 Biceps brachii is the prime mover of elbow flexion Antagonist muscle that opposes or reverses a particular movement 0 Help to regulate the action of a prime mover by contracting slightly to provide some resistance 0 Triceps brachii are the antagonists in elbow flexion Synergist additional muscle that assists 0 Help prime movers by adding a little extra force or by reducing undesirable movements 0 Act as joint stabilizers Fixator a synergist that immobilizes a bone Naminq Skeletal Muscles Criteria includes 1 Location of the muscle 1 Temporalis muscle lies over the temporal bone 2 Shape of the muscle 1 Deltoid is a triangular muscle 3 Relative size of the muscle 1 Gluteus maximus is the large gluteus muscle 4 Direction of muscle fibers 1 Rectus femoris is the straight muscle of the femur 5 Number of origins 1 Biceps have two origins 6 Location of the attachments 1 Sternocleidomastoid attaches to sternum clavicle and mastoid process 7 Action 1 Adductor longus brings about thigh adduction Arrangement of Fascicles Fascicles are bundles of fibers that form muscles Major arrangements include 0 Circular also known as sphincter muscles usually surround external body openings and close by contracting I Example is orbicularis muscles around the eyes and mouth 0 Convergent broad origin with fascicles that converge towards a single tendon of insertion triangular or fan shaped I Pectoralis major muscle of the anterior thorax 0 Parallel long axes of fascicles run parallel to the long axis of the muscle usually straplike I Sartorius muscle of the thigh o Fusiform spindleshaped muscles with an expanded belly I Biceps brachii of the arm 0 Pennate fascicles are short and attach obliquely to a central tendon that runs the length of a muscle I Unipennate fascicle inserts to only one side of the tendon I Extensor digitorum longus of the leg I Bipennate fascicles insert into the tendon from opposite sides I Rectus femoris of the leg I Multipennate looks like many feathers situated side by side with all of their quills inserting into one large tendon I Deltoid muscle of the shoulder


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