A&P Lab 6 - Appendicular Mucles

What Muscle is this, and what is it origin and insertion points?

Deltoid

Origin:

Anterior portion-anterior border and superior surface of the lateral third of the clavicle

Middle portion-Lateral border of the acromion process

Posterior portion: Lower border of the crest of the spine of scapula

Insertion: Deltoid tuberosity, on the middle of the lateral surface of the shaft of the humerus

Action:

Anterior portion: Flexes and medially rotates arm

Middle portion: Abducts arm

Posterior portion: extends and laterally rotates arm

What Muscle is this, and what is it origin and insertion points?

Latissimus Dorsi
Origin: Spinous processes of the lower six thoracic vertebrae, lumbar vertebrae, sacral vertebrae, supraspinal ligament, and posterior part of the iliac crest through the lumbar fascia, lower three or four ribs, inferior angle of scapula spinous processes T7-L5, thoracolumbar fascia, iliac crest

Insertion: Floor (bottom) of the bicipital groove of humerus, intertubercular sulcus

Action: Extends, abducts, and medially rotates the arm, draws the shoulder downward and backward, keeps inferior angle of scapula against the chest wall, accessory muscle of respiration

What Muscle is this, and what is it origin and insertion points?

Pectoralis Major

Origin: Clavicular part-medial half of the clavicle sertnocostal part-sternum, upper six costal cartilages, aponeurosis of external oblique

Insertion: Lateral lip of intertubercular (bicipital) groove of humerus, crest below greater tubercle of the humerus

Action: Both parts adduct, medially rotate arm, clavicular part flexes arm from full extension, sternocostal part extends the flexed arm

What Muscle is this, and what is it origin and insertion points?

Pectoralis Minor

Origin: External surfaces of the third, fourth and fifth ribs

Insertion: Coracoid process of the scapula

Action: Draws scapula forward and downward, raises ribs in forced inspiration

What Muscle is this, and what is it origin and insertion points?

Serratus Anterior

Origin: Outer surfaces and superior borders of first eight or nine ribs, and fascia covering first intercostal space

Insertion: Anterior surface (costal surface) of the medial border of the scapula, corocoid process

Action: Rotates scapula for abduction and flexion of arm, protracts scapula

What Muscle is this, and what is it origin and insertion points?

Teres Major

Origin: Lower third of the posterior surface of the lateral border of the scapula, near the inferior angle

Insertion: Medial lip of the bicipital groove of the humerus

Action: Medially rotates arm, adducts arm, extends arm

What Muscle is this, and what is it origin and insertion points?

Teres Minor

Origin: upper two-thirds of the dorsal surface of the axillary border of the scapula

Insertion: The capsule of the shoulder joint, the lower facet of the greater tuberosity of the humerus

Action: Laterally rotates arm, weakly adducts arm, draws humerus toward glenoid fossa

What Muscle is this, and what is it origin and insertion points?

Subscapularis

Origin: Subscapular fossa on the anterior surface of scapula

Insertion: Lesser tuberosity of the humerus, ventral part of the capsule of the shoulder joint

Action: Medially rotates arm, stabilizes glenohumeral joint

What Muscle is this, and what is it origin and insertion points?

Infraspinatus

Origin: Infraspinous fossa of the scapula

Insertion: Middle facet of the greater tuberosity of the humerus, capsule of the shoulder joint

Action: Draws humerus toward glenoid fossa thus resisting posterior dislocation of arm as in crawling, laterally rotates abducts arm

What Muscle is this, and what is it origin and insertion points?

Supraspinatus

Origin: Supraspinous fossa of scapula

Insertion: upper part of the greater tuberosity of the humerus, capsule of the shoulder joint

Action: Aids deltiod in abduction of arm, draws humerus toward glenoid fossa preventing deltoid from forcing humerus up against acromion, weakly flexes arm

What Muscle is this, and what is it origin and insertion points?

Biceps Brachii

Origin: Long head-supraglenoid tubercle of scapula, short head-coracoid process of scapula

Insertion: Tuberosity of radius, bicipital aponeurosis into deep fascia on medial part of forearm

Action: Supinates forearm, flexes forearm, weakly flexes arm at shoulder

What Muscle is this, and what is it origin and insertion points?

Brachialis

Origin: Anterior of lower half of humerus

Insertion: Coronoid process of ulna, tuberosity of ulna

Action: Flexes forearm

What Muscle is this, and what is it origin and insertion points?

Brachioradialis

Origin: Upper two-thirds of lateral supracondylar ridge of humerus

Insertion: Base of styloid process and lateral surface of radius

Action: Flexes forearm

What Muscle is this, and what is it origin and insertion points?

Triceps Brachii

Origin: Long head-infra-glenoid tubercle of the scapula, Lateral head-upper half of the posterior surface of the shaft of the humerus, Medial head- posterior surface of the lower half of the shaft of the humerus

Insertion: Posterior part of olecranon process of the ulna

Action: extends forearm, long head aids in adduction if arm is abducted

What Muscle is this, and what is it origin and insertion points?

Anconeus

Origin: Posterior part of lateral epicondyle of the humerus

Insertion: Lateral surface of the olecranon process and posterior surface of ulna

Action: Extends forearm (assists triceps)

What Muscle is this, and what is it origin and insertion points?

Pronator Quadratus

Origin: Anterior surface of distal part of shaft of ulna

Insertion: Lower portion of anterior surface of shaft of radius, distal part of lateral border of radius

Action: Pronated forearm and hand

What Muscle is this, and what is it origin and insertion points?

Pronator Teres

Origin:

Humeral head - Medial supracondylar ridge and medial epicondyle of the humerus

Ulnar head - Medial border of the coronoid process of the ulna

Insertion: Middle of lateral surface of the radius (pronator tuberosity)

Action: Pronated and flexes forearm

What Muscle is this, and what is it origin and insertion points?

Flexor Carpi Radialis

Origin: Medial epicondyle of the humerus through the common tendon

Insertion: Front of the bases of the second and third metacarpal bones

Action: Flexes hand, synergist in abduction with extensor carpi radialis longus and brevis

What Muscle is this, and what is it origin and insertion points?

Flexor Carpi Ulnaris

Origin:

Humeral head - medial epicondyle of the humerus through the common tendon

Ulnar head - medial margin of olecranon process of ulna, dorsal border of shaft of the ulna

Insertion: Pisiform bone, hook of the hamate, and base of the fifth metacarpal bone

Action: Flexes hand, synergist in adduction of hand with extensor carpi ulnaris

What Muscle is this, and what is it origin and insertion points?

Flexor Digitorum Superficialis

Origin:

Humeroulnar head - Medial epicondyle of the humerus through common tendon, medial margin of the coronoid process of ulna

Radial head - anterior surface of shaft of radius

Insertion: Four tendons divide into two slips each, slips insert into sides (margins of the anterior surfaces) of the middle phalanges of four fingers

Action: Flexes the middle phalanges of the fingers

What Muscle is this, and what is it origin and insertion points?

Palmaris Longus

Origin: Medial Epicondyle of the humerus through the common tendon

Insertion: Front (central part) of the flexor retinaculum and apex of the palmar aponeurosis

Action: Flexes the hand

What Muscle is this, and what is it origin and insertion points?

Abductor pollicis longus

Origin: Posterior Surface of shaft of radius, ulna, interosseous membrane

Insertion: Posterior surface of base of first metacarpal bone

Action: Abducts, laterally rotates, and extends thumb abducts wrist

What Muscle is this, and what is it origin and insertion points?

Supinator

Origin: Lateral epicondyle of humerus, lateral ligament of superior radioulnar joint, supinator crest of ulna

Insertion: Dorsal and lateral surfaces of upper third of radius

Action: Supinates forearm

What Muscle is this, and what is it origin and insertion points?

Extensor Carpi Radialis Longus

Origin: Lower third of lateral supracondylar ridge of humerus

Insertion: Posterior surface of the base of the second metacarpal bone

Action: Extends hand, synergist in abduction of hand with flexor carpi radialis

What Muscle is this, and what is it origin and insertion points?

Extensor Carpi Ulnaris

Origin: Common tendon attached to lateral epicondyle of humerus

Insertion: Posterior surface of base of fifth metacarpal bone

Action: Extends hand, synergist in adduction of hand with flexor carpi ulnaris

What Muscle is this, and what is it origin and insertion points?

Extensor Digitorum

Origin: Common tendon attached to lateral epicondyle of humerus

Insertion: Lateral and dorsal surfaces of all the phalanges of the four fingers

Action: Extends the fingers and wrists

What Muscle is this, and what is it origin and insertion points?

Gluteus Maximus

Origin: Outer surface of ilium behind posterior gluteal line, adjacent posterior surface of sacrum and coccyx, sacrotuberous ligament, aponeurosis of erector spinae

Insertion: Lliotibial tract of fascia lata, gluteal tuberosity of femur

Action: upper part - abducts, laterally rotates thigh

lower part - extends, laterally rotates thigh, extends trunk

What Muscle is this, and what is it origin and insertion points?

Gluteus Medius

Origin: Outer surface of ilium inferior to iliac crest

Insertion: Lateral surface of greater trochanter

Action: Abducts femur at hip joint and rotates thigh medially

What Muscle is this, and what is it origin and insertion points?

Gluteus Minimus

Origin: Outer surface of ilium between middle (anterior) and inferior gluteal lines

Insertion: Anterior surface of greater trochanter

Action: Abducts femur at hip joint and rotates thigh medially

What Muscle is this, and what is it origin and insertion points?

Tensor Fasciae Latae Is really just the small portion up top, it is than connected to the illotibial tract (IT band)

What Muscle is this, and what is it origin and insertion points?

Adductor Brevis

What Muscle is this, and what is it origin and insertion points?

Adductor Longus

What Muscle is this, and what is it origin and insertion points?

Adductor Magnus

What Muscle is this, and what is it origin and insertion points?

Illiacus

What Muscle is this, and what is it origin and insertion points?

Psoas

What Muscle is this, and what is it origin and insertion points?

Piriformis

What Muscle is this, and what is it origin and insertion points?

Quadratus Femoris

What Muscle is this, and what is it origin and insertion points?

Gemellus Inferior

What Muscle is this, and what is it origin and insertion points?

Gemellus Superior

What Muscle is this, and what is it origin and insertion points?

Obturator Externus

What Muscle is this, and what is it origin and insertion points?

Obtutator Internus

What Muscle is this, and what is it origin and insertion points?

Biceps Femoris

What Muscle is this, and what is it origin and insertion points?

Semimembranosus

What Muscle is this, and what is it origin and insertion points?

Semitendinosus

What Muscle is this, and what is it origin and insertion points?

Rectus Femoris

What Muscle is this, and what is it origin and insertion points?

vastus medialis

What Muscle is this, and what is it origin and insertion points?

Vastus Lateralis

What Muscle is this, and what is it origin and insertion points?

Vastus intermedius (under the rectus femoris)

What Muscle is this, and what is it origin and insertion points?

Gracilis (most medial muscle)

What Muscle is this, and what is it origin and insertion points?

Sartorius

What Muscle is this, and what is it origin and insertion points?

Gasteocnemius

What Muscle is this, and what is it origin and insertion points?

What Muscle is this, and what is it origin and insertion points?

What Muscle is this, and what is it origin and insertion points?