Biology 160 Arm Muscles Scott lehbauerlethbridgecollege ab ca

Biology 160 Arm Muscles Scott. lehbauer@lethbridgecollege. ab. ca

Deltoid ORIGIN • • • Anterior – lateral 1/3 of the clavicle Medial – Acromion process Posterior – lower portion of the spine of the scapula INSERTION • Deltoid Tuberosity FUNCTION • Abducts arm • Flexes arm • Extends arm

Biceps Brachii ORIGIN • Supraglenoid Tubercle of scapula • Coracoid process of scapula INSERTION • Radial Tuberosity FUNCTION • Flexes and supinates arm Biceps Brachii

Brachialis ORIGIN • Anterior Humerus INSERTION • Coronoid process • Tuberosity of ulna FUNCTION • Flexes elbow Brachialis

Flexor Carpi Ulnaris ORIGIN • Medial epicondyle of humerus INSERTION • Pisiform • hook of hamate • base of 5 th metacarpal FUNCTION • Flex and adduct wrist • Ulnar deviation Flexor Carpi Ulnaris

Palmaris Longus ORIGIN • Medial Epicondyle of humerus INSERTION • Palmar Aponeurosis FUNCTION • Flex wrist Palmaris Longus

Flexor Carpi Radialis ORIGIN • medial epicondyle of humerus INSERTION • base of the 2 nd and 3 rd metacarpals FUNCTION • Flexes and abducts wrist Flexor Carpi Radialis

Flexor Digitorum Superficialis ORIGIN • Medial epicondyle of the humerus • Shaft of the radius INSERTION • Both sides of the middle phalynx of the fingers FUNCTION • Flexes the fingers Flexor Digitorum Superficialis

Special Notes • The common origin for the flexors of the wrist is the medial epicondyle of the humerus. • The Palmaris Longus is completely absent in about 8% of the population.

Brachioradialis ORIGIN • Lateral epicondyle of the humerus INSERTION • Styloid process of the radius FUNCTION • Flexes and supinates forearm Brachioradialus

Pollicis Muscles (just know Function) FUNCTION • Adduct, flex, abduct, extend and oppose thumb Pollicus Muscles

Rotator Cuff Muscles 1. 2. 3. 4. Supraspinatus (GT) Infraspinatus (GT) Subscapularis (LT) Teres Minor (GT) *** Special note that one function of all the rotator cuff muscles is shoulder stabilization.

Supraspinatus ORIGIN • Supraspinous fossa of the scapula INSERTION • Greater Tuberosity of the humerus FUNCTION • Abducts the arm Supraspinatus

Infraspinatus ORIGIN • Infraspinous fossa of the scapula INSERTION • Greater tuberosity of the humerus FUNCTION • Lateral rotation of the humerus Infraspinatus

Subscapularis ORIGIN • Anterior surface of the scapula INSERTION • Lesser tuberosity of the humerus FUNCTION • Medial rotation of the humerus Subscapularis

Teres Minor ORIGIN • Lateral border of the scapula INSERTION • Greater tuberosity of the humerus FUNCTION • Lateral rotation of the humerus Teres Minor

Teres Major ORIGIN • Lateral border of the scapula INSERTION • Medial lip of the intertubercular groove of the humerus FUNCTION • Extends, adducts and medially rotates the humerus “swimming motion” Teres Major

Triceps Brachii ORIGIN • Infraglenoid tubercle of the humerus • Lateral and medial surfaces of humerus INSERTION • Olecranon process of the ulna FUNCTION • Extends the elbow Triceps Brachii

Extensor Carpi Radialis Longus ORIGIN • Lateral epicondyle of the humerus INSERTION • Base of the 2 rd metacarpal FUNCTION • Extends and abducts wrist • Radial deviation Extensor Carpi Radialis Longus

Extensor Carpi Radialis Brevis ORIGIN • Lateral epicondyle of the humerus INSERTION • base of the 3 rd metacarpal FUNCTION • Extends and abducts wrist • Radial deviation Extensor Carpi Radialis Brevis

Extensor Digitorum Communis ORIGIN • Lateral epicondyle of the humerus INSERTION • Posterior surfaces of fingers 25 FUNCTION • Extends fingers and wrist Extensor Digitorum Communis

Extensor Carpi Ulnaris ORIGIN • Lateral epicondyle of the humerus INSERTION • Base of the 5 th metacarpal FUNCTION • Extends and adducts the wrist • Ulnar deviation Extensor Carpi Ulnaris

Rhomboid Major ORIGIN • Spinous process of T 2 – T 5 INSERTION • Medial border of the scapula FUNCTION • Scapula retraction

Rhomboid Minor ORIGIN • Spinous process of C 7 -T 1 INSERTION • Medial border of the scapula FUNCTION • Retracts the scapula

Biology 160 Muscles (Need to Know) • Due to the amount of information and the lack of study time the lab I have decided to eliminate some of the material for the lab final on muscles. Below is a list of the information that you will need to know. • ****You will need to know the function and location for all the muscles in your lab book

Biology 160 Muscles (Need to Know) ARM LAB 1 You will need to know the origins, insertions and functions for these muscles • 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16 • 17, 18, 19, 20 (Just the origin)

Biology 160 Muscles (Need to Know) Leg Lab 2 You will need to know the origins, insertions and functions for these muscles • 1, 2, 4, 5, 6, 7, 8, 9, 11, 12, 17, 18, 19, 20, 21, 22, • Psoas Major and Iliacus

Biology 160 Muscles (Need to Know) Torso Lab 3 You will need to know the origins, insertions and functions for these muscles • 1, 2, 3, 4, 5, 6, 7, 8, 9