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Skeletal Muscle Review Anatomy and Physiology I Unit 8 – The Muscular System
The Skeletal Muscles There are about 650 muscles in the human body. They enable us to move, maintain posture and generate heat. In this section we will only study a sample of the major muscles.
Flexion Types of Musculo-Skeletal Movement
Abduction, Adduction & Circumduction
Muscle Attachments Origin Insertion
Sternocleidomastoideus Flexes and Rotates Head
Masseter Elevate Mandible
Temporalis Elevate & Retract Mandible
Trapezius Extend Head, Adduct, Elevate or Depress Scapula
Latissimus Dorsi Extend, Adduct & Rotate Arm Medially
Deltoid Abduct, Flex & Extend Arm
Pectoralis Major Flexes, adducts & rotates arm medially
Biceps Brachii Flexes Elbow Joint
Triceps Brachii Extend Elbow Joint
Rectus Abdominus Flexes Abdomen
External Oblique Compress Abdomen
External Intercostals Elevate ribs
Internal Intercostals Depress ribs
Forearm Muscles Flexor carpi—Flexes wrist Extensor carpi—Extends wrist Flexor digitorum—Flexes fingers Extensor digitorum—Extends fingers Pronator—Pronates Supinator—Supinates
Gluteus Maximus Extends & Rotates Thigh Laterally
Rectus Femoris Flexes Thigh, Extends Lower Leg
Gracilis Adducts and Flexes Thigh
Sartorius Flexes Thigh, & Rotates Thigh Laterally
Biceps Femoris Extends Thigh & Flexes Lower Leg
Gastrocnemius Plantar Flexes Foot & Flex Lower Leg
Tibialis Anterior Dorsiflexes and Inverts Foot
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1.Name the type of muscle below that does not contain the vertical striations seen in this picture:
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How Do Muscles Work? Types of Movement. Flexion: The decreasing of an angle between bones. One of the bones of the joint moves towards the other bone.
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