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Anatomy & Phy 1

Chapter 11 & 12 Muscular System

Sarcomeres The Smallest contractile unit of muscle; extends from one Z disc to the next
Neuromuscular junction The region where a motor neuron comes into close contact with a skeletal muscle cell
Motor unit a motor neuron and all the muscle cells it supplies.
Synaptic cleft the fluid filled space at a synapse between neurons
Know the names of the 2 contractile proteins Actin & Mycin
Know the 3 connective tissue coverings of skeletal muscles from the inside out Endomysium, Perimysium and Epimysium
Know the different ways skeletal muscle is named Location of origin, insertion, Location, Shape, Direction of muscle fibers, Size, Action & Number of Origin
Orbicularis Oris Closes Mouth & protrudes lips
Sternocleidomastoid Flex Neck forward/ Back & Rotates
Pectoralis Major Adducts and Flexes ,Medially Rotates and Moves Arm/ Humerus
Rectus Abdominis Flex’s Vertebral Column
Biceps Brachii Flexes Elbow & Supinates forearm
Triceps Brachii Powerful Arm Extender Antagonist of Biceps Brachii
Gluteus Maximus Powerful Hips Extensor (Forceful)(Climbing Stairs)
Gastrocnemius Planter Flexes Foot & Flexes Knee when in Dorsiflexed. Crosses Knee Joint
Know the 4 muscles that make up the quadriceps Rectus Femoris, (3 Vastus Muscles) Vastus Lateralis, Vastus Medialis, Vastus Intermedius
Know the 3 muscles that make up the hamstring Biceps Femoris, Semitendinosus & Semimembranosus
Created by: 1815104090