Muscle Terms- Practical 2 Review with Diagrams.docx

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University of Maryland
Biological Sciences Program
BSCI 201
Justicia Opoku

Facial Expression Muscle Action Origin- stays still Insertion- moves Frontal Belly Raises eyebrows Galea aponeurotica Skin of eyebrows (Epicranius) Occipital Belly Pulls scalp back Occipital bones Galea aponeurotica (Epicranius) Orbicularis Oculi Closes eyes Frontal bones Inserts of eyelid tissue Orbicularis Oris Closes lips Maxilla Encircles mouth Zygomaticus minor Smile Zygomatic bone Skin at corner of mouth Zygomaticus major Smile Zygomatic bone Skin at corner of mouth Buccinator Compresses cheeks Mandible Orbicularis oris The Jaw Masseter- in front of ear Closes jaw Zygomatic arch Angle of mandible Temporalis Closes jaw Temporal fossa Coronoid process of mandible The Neck Platysma Tenses skin of neck Deltoid Lower margin of mandible Sternocleidomastoid Flexion of neck forward Medial of clavicle Mastoid process of temporal bone Thorax, Shoulder, Abdominal Wall Muscle Action Origin Insertion Pectoralis Major Prime mover of arm Clavicle Intertubercular sulcus flexion, rotates arm in humerus Pectoralis Minor Draws scapula forward Anterior surface of ribs Coracoid process- scapula Serratus Anterior Rotate scapula Lateral aspects of ribs Anterior surface of scapula Deltoid Prime mover of arm Acromion Deltoid tuberosity of abduction humerus External Intercostals Elevate rib cage Inferior border of rib Superior border of rib below Internal Intercostals Depress rib cage Superior border of rib Inferior border of rib below above Diaphragm Prime mover of Lumbar vertebrae Central tendon inspiration, flattens on contraction Rectus Abdominis Rotate vertebral column Pubic crest Xiphoid process External Obliques Compress abdominal Anterior surface of 8 Pubic crest wall ribs Internal Obliques Compress abdominal Iliac crest Pubic crest wall Transversus Compress abdominal Iliac crest Pubic crest Abdominis contents Human Trunk- the Back Muscle Action Origin Insertion Trapezius Rotates scapula Thoracic vertebrae Acromion of scapula Latissimus Dorsi Prime mover of arm Lumbar vertebrae Floor of humerus extension Rhomboids Minor Stabilize scapula Spinous process- Medial border of pointed tip of vertebrae scapula Rhomboids Major Stabilize scapula Spinous process Medial border of scapula Muscles of Scapula (rotator cuff) Lateral rotation of Infraspinous fossa of Greater tubercle of Infraspinatus humerus scapula humerus Supraspinatus Lateral rotation of Supraspinous fossa of Greater tubercle humerus scapula Teres Minor Lateral rotation of Lateral margin of Greater tubercle humerus scapula Teres Major Rotation of humerus Inferior angle of Intertubercular sulcus scapula of humerus Humerus Muscles act on Forearm Muscle Action Origin Insertion Triceps Brachii Forearm extensor Inferior of glenoid cavityOlecranon process- opposite end of ulna head Flexion of elbow Coracoid process- Radial tuberosity- bump Biceps Brachii - muscle closer to body scapula near the head Supraglenoid tubercle Brachialis Flexion of forearm Distal of anterior Coronoid process- lower humerus than olecranon of ulna Brachioradialis Synergist (helper) in Distal end of humerus Styloid process of forearm flexion radius- opposite end of head Humerus Muscles act on Hands/ Fingers Pronator Teres-inner Pronate forearm Medial epicondyle of Midshaft of radius elbow humerus Flexor Carpi Flexor of wrist Medial epicondyle Base of metacarpals Radialis Flexor of wrist Medial epicondyle Base of metacarpal 5 Flexor Carpi Ulnaris Palmaris Longus Tenses skin Medial epicondyle Skin of palm 4. Extensor carpi Extend wrist Lateral supracondylar Base of metacarpal 2 radialis Longus ridge of humerus 3. Extensor carpi Extend wrist Lateral epicondyle of Base of metacarpal 3 humerus radialis Brevis thumb side 2. Extensor Prime mover of finger Lateral epicondyle Distal phalanges Digitorum extension 1.Extensor carpi Extend wrist Lateral epicondyle Base of metacarpal 5 ulnaris Supinator on outside Acts w/ biceps brachii to Lateral epicondyle Proximal end of radius edge of elbow supinate forearm Radial head by the elbow, ulna head at other end by wrist Pronator teres touches flexor carpi radialis Under forearm: (thumb side) Brachioradialis- Flexor Carpi Radialis- Palmaris Longu
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