2nd Order Lab #2

Triceps brachii M, long head

• function: Extends arm; adducts arm

• Innervation: Radial Nerve (C5-C7)

• Attachments:

P: Infraglenoid tubercle of scapula

D: Olecranon process of ulna

Tibialis Anterior M

• function: dorsiflexes foot; inverts foot

• innervation: Deep Fibular Nerve (L4-S1)

• attachments:

P: Lateral Condyle and proximal shaft of tibia; interosseous membrane

D: Metatarsal I and first (medial) cuneiform

Semitendinosus M

• function:

- extends thigh and flexes leg at the knee joint

- medially rotates leg when flexed at knee

• innervation: Tibial division of sciatic nerve (L4-S1 fibers)

• Attachments:

P: Ischial tuberosity

D: Proximal medial surface of tibia

Adductor Longus M

• function: adducts thigh; flexes thigh

• Innervation= obturator nerve (L2-L4)

• Attachment:

P: Pubis near pubic

D: Linea Aspera of femur

Rectus Femoris M

Function: flexes thigh; extends leg at knee joint

Innervation: Femoral Nerve (L2-L4)

Attachments:

P: Anterior inferior iliac spine

D: Quadriceps tendon to patella and then patellar ligament to tibial tuberosity

Gastrocnemius M

• function:

- flexes leg at the knee joint

- plantar flexes foot

• innervation: tibial nerve (L4-S1)

• attachments:

P: Superior posterior surfaces of lateral and medial condyles of femur

D: Calcaneus (via calcaneal tendon)

Brachioradialis M

Function: flexes forearm

Innervation: Radial Nerve (C6-C7 fibers)

Attachments:

P: Lateral supracondylar ridge of humerus

D: Styloid process of radius

Pectoralis Major M

Function: Agonist of arm flexion; adducts arm; medially rotates arm

Innervation: Lateral pectoral (C5-C7) and medial pectoral (C8-T1) nerves

Attachments:

P: Medial clavicle; costal cartilages of ribs 2-6; body of sternum

D: Lateral Part of intertubercular sulcus of humerus

Coracobrachialis M

Function: Adducts arm; flexes arm

Innervation: Musculocutaneous nerve (C5-C6 fibers)

Attachments:

P: Coracoid process of scapula

D: Middle medial shaft of humerus

Biceps Brachii M

Function: flexes arm (weakly)

Innervation: Musculocutaneous nerve (C5-C6 fibers)

Attachments:

P: Supraglenoid tubercle of scapula and coracoid process of scapula

D: Radial Tuberosity and Bicipital aponeurosis

Triceps Brachii M, lateral head

• function:

- primary extensor of forearm

- adducts arm at the glenohumeral joint

• innervation: Radial Nerve (C5-C7 fibers)

Triceps brachii M, medial head

• function:

- primary extensor of forearm

- adducts arm at the glenohumeral joint

• innervation: Radial Nerve (C5-C7 fibers)

Radial N

Pronator Teres M

• function:

- Pronates forearm

• innervation: Median Nerve (C6-C7 fibers)

Flexor Carpi Radialis M

• function: flexes hand; abducts hand at the wrist

• innervation: Median Nerve (C6-C7 fibers)

Palmaris Longus M

some cadavers might not have

• function: Weak flexor of the hand at the wrist

• innervation: Median Nerve (C6-C7 fibers)

Flexor Digitorum Superficialis M

• function: flexes hand at the wrist; flexes MP (metacarpophalangeal) joints; flexes PIP (proximal interphalangeal) joints of fingers 2-5

• innervation: Median Nerve (C6-C7)

attachment:

D: Middle phalanges of fingers 2-5

Flexor Carpi Ulnaris M

• function: Flexes hand; adducts hand at the wrist

• innervation: Ulnar Nerve (C8-T1)

Brachial A branches into…

Radial A (laterally) and Ulnar A (medially)

Radial A

Ulnar A

Median NN

Ulnar NN

Superficial Palmar Arch

Flexor Digitorum Profundus M

• function: flexes hand at the wrist; flexes MP (metacarpophalangeal) joints; flexes PIP (proximal interphalangeal) joints; flexes DIP (distal interphalangeal) joints of fingers 2-5

• innervation: Lateral one-half of muscle innervated by median nerve (C6-C8 fibers)

Medial one-half of muscle innervated by ulnar nerve (C8 fibers)

• attachments:

D: Distal Phalanges of fingers 2-5

Flexor Pollicis Longus M

• function: flexes MP (metacarpophalangeal) joint of thumb; flexes IP (interphalangeal) joint of thumb; weakly flexes hand at the wrist

• innervation: Median Nerve (C6-C7 fibers)

Pronator Quadratus M

• function: pronates forearm

• innervation: median nerve (C8-T1 fibers)

Ulnar A branches into…

Common Interosseous A (Inferior/Superior branches) and Ulnar recurrent AA

Common Interosseous A

Ulnar Recurrent AA

Radial Recurrent A

Hypothenar Muscle Group

• muscles on medial side of palm

1) Abductor digiti minimi M

2) Flexor Digiti Minimi brevis M

3) Opponens Digiti Minimi M

Abductor digiti minimi M

• function: Abducts little finger (finger 5)

• innervation: Ulnar Nerve (C8-T1)

Flexor Digiti Minimi brevis M

• function: Flexes little finger (finger 5)

• innervation: Ulnar Nerve (C8-T1)

Opponens Digiti Minimi M

• function: opposition of little finger (finger 5)

• innervation: Ulnar Nerve (C8-T1)

Thenar Muscle Group

• 3 muscles on lateral side of palm

1) Abductor pollicis brevis M

2) Flexor pollicis brevis M

3) Opponens Pollicis M

Abductor pollicis brevis M

• function: abducts thumb

• innervation: median nerve (C8-T1 fibers)

Flexor pollicis brevis M

• function: flexes thumb

• innervation: median nerve (C8-T1 fibers)

Opponens Pollicis M

• function: Opposition of thumb

• innervation: median nerve (C8-T1 fibers)

Adductor pollicis M

• function: Adducts thumb

• innervation: ulnar nerve (C8-T1)

Lumbrical MM (Hand)

• funcion: flexing metacarpophalangeal joints while extending the interphalangeal joints

• innervation: Median nerve and ulnar nerve

Interosseous MM

• function:

Dorsal= abducts fingers 2-5; flexes MP joints of fingers 2-5; extends DIP joints of fingers 2-5

Palmar= adducts fingers 2-5; flexes MP joints of fingers 2-5; extends PIP joint; extends DIP joints of fingers 2-5

• innervation: Ulnar nerve (C8-T1)

Deep palmer arch

Biceps femoris M, short head

• function: flexes leg at the knee joint; laterally rotates leg when flexed at knee

• innervation: Common fibular division of sciatic nerve (L5-S1 fibers)

Biceps femoris M, long head

• function: extends thigh, flexes leg at the knee joint, laterally rotates leg when flexed at knee

• innervation: Tibial division of sciatic nerve (L4-S1 fibers)

Semimembranosus M

• function: extends thigh and flexes leg at the knee joint; medially rotates leg when flexed at knee

• innervation: Tibial division of sciatic nerve (L4-S1 fibers)

Sciatic N

Adductor Magnus M

• function: adducts thigh

Adductor part: flexes thigh

Hamstring part: extends thigh; laterally rotates thigh

• innervation:

Adductor part: obturator nerve (L2-L4)

Hamstring part: Tibial division of sciatic nerve (L2-L4 fibers)

Common Fibular N branches into….

Superficial fibular N and Deep Fibular N

Tibial N

Small Saphenous V

Medial and Lateral Sural Cutaneous NN

Sural N

Popliteal A and V

Popliteal A and V branches into….

Anterior Tibial A/V, Posterior tibial A/V, Middle genicular A, medial and lateral, superior and inferior genicular AA

Sural AA

Plantaris M

function: Weakly flexes leg at knee joint; weakly plantar flexes foot

Innervation: Tibial nerve (L4-S1 fibers)

Popliteus M

Function: Flexes leg at the knee joint; medially rotates tibia to unlock the knee

Innervation: Tibial Nerve (L4-L5 fibers)

Soleus M

Function: Plantar flexes foot

Innervation: Tibial Nerve (L4-S1 fibers)

Flexor Digitorum longus M (foot)

Function: Plantar flexes foot; flexes MP joints; flexes PIP joints; Flexes DIP joints of toes 2-5

Innervation: Tibial Nerve (L5-S1 fibers)

Tibialis posterior M

Function: Plantar flexes foot; inverts foot

Innervation: Tibial nerve (L5-S1 fibers)

Flexor hallucis longus M (foot)

Function: Plantar flexes foot; flexes MP joint; flexes IP joint of great toe (toe1)

Innervation: Tibial Nerve (L5-S1 fibers)

Anterior tibial A and V

Posterior tibial A and V

Tibial N

Superficial fibular N

Fibularis (peroneus) brevis M

Function: Everts foot; weak plantar flexor of foot

Innervation: Superficial fibular nerve (L5-S2)

Abductor hallucis M

Function: Abducts great toe (toe 1)

Innervation: Medial Plantar nerve (S2-S3)

Abductor digiti Minimi M

Function: Abducts little toe (toe 5)

Innervation: Lateral plantar nerve (S2-S3)

Flexor Digitorum Brevis M

Function: Flexes MP and PIP joints of toes 2-5

Innervation: Medial Plantar Nerve (S2-S3)

Tendon of the flexor hallucis longus M

Tendon of flexor digitorum longus M

Quadratus Plantae M

Function: Pulls on flexor digitorum longus tendons to flex toes 2-5

Innervation: Lateral plantar nerve (S2-S3)

Lumbrical MM (Foot)

• function: flexes MP joints and extends PIP and DIP joints of toes 2-5

• innervation: Medial plantar nerve (1st lumbrical); lateral plantar nerve (2th-4th lumbricals)

• attachments:

P: Tendons of flexor digitorum longus

D: Tendons of extensor digitorum longus

Medial and Lateral Plantar NN and AA

Flexor Hallucis Brevis M

Function: Flexes MP joint of great toe (toe 1)

Innervation: Medial Plantar Nerve (S2-S3)

Adductor Hallucis M

Function: Adducts great toe(toe 1)

Innervation: Lateral Plantar Nerve (S2-S3)

Flexor Digiti Minimi Brevis M (foot)

Function: Flexes MP joint of little toe (toe 5)

Innervation: Lateral Plantar Nerve (S2-S3)

Plantar Interossel M

function: adducts toes

Innervation: Lateral Plantar nerve (S2-S3)

Tendon of the Tibialis posterior M

Tendon of the fibularis longus M

Function: everts foot; weak plantar flexor of foot

Innervation: Superficial fibular nerve (L5-S2)

attachments:

D: Base of metatarsal I; medial cuneiform bone

Plantar Arch