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

Deltoid

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)

FUNCTION• Adduct, flex, abduct,

extend and oppose the thumb

Pollicus Muscles

Rotator Cuff Muscles

1. Supraspinatus (GT)2. Infraspinatus (GT)3. Subscapularis (LT)4. 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

humerusSubscapularis

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 1You 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 2You 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 3You will need to know the origins, insertions

and functions for these muscles

• 1,2,3,4,5,6,7,8, 9