Biology 160 Arm Muscles
Scott.lehbauer@lethbridgecollege.ab.ca
Deltoid
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 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.
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 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 25
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