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

Deltoid ORIGIN INSERTION Deltoid Tuberosity FUNCTION Abducts arm 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 5th 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 2nd and 3rd 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) Adduct, flex, abduct, extend and oppose the thumb Pollicus Muscles

Rotator Cuff Muscles 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 2rd 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 3rd 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 2-5 FUNCTION Extends fingers and wrist Extensor Digitorum Communis

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

Rhomboid Major ORIGIN Spinous process of T2 – T5 INSERTION Medial border of the scapula FUNCTION Scapula retraction

Rhomboid Minor ORIGIN Spinous process of C7-T1 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