Specific Muscles and Features Part 2

Origin of Biceps brachii

Short head: coracoid process, Long head: edge of glenoid cavity

Insertion of Biceps brachii

Radial tuberosity (of radius)

Action of Biceps brachii

Flexes and supinates forearm

Innervation of Biceps brachii

Musculocutaneous nerve

Origin of Brachialis

Anterior surface of distal humerus (flanks deltoid tuberosity)

Insertion of Brachilais

Coronoid process of ulna

Action of Brachialis

Flexes forearm

Innervation of Brachialis

Musculocutaneous nerve

Origin of Adductor longus

Close to pubic symphysis

Insertion of Adductor longus

Linea aspera

Action of Adductor longus

Adducts, flexes and medially rotates thigh

Innervation of Adductor longus

Obturator nerve

Origin of Adductor magnus

Ischium, pubis and ischial tuberosity

Insertion of Adductor magnus

Linea aspera and adductor tubercle (just superior to medial femoral epicondyle)

Action of Adductor magnus

Adducts, flexes and medially rotates thigh, extends thigh

Innervation of Adductor magnus

Obturator and sciatic nerves

Origin of Biceps femoris

Ischial tuberosity (long head), linea aspera (short head)

Insertion of Biceps femoris

Head of fibula, lateral tibial condyle

Action of Biceps femoris

Extends thigh, flexes lower leg

Innervation of Biceps femoris

Sciatic nerve

Origin of Gastrocnemius

Medial and lateral femoral condyles

Insertion of Gastrocnemius

Calcaneus via Achilles tendon

Action of Gastrocnemius

Plantarflexes foot, flexes lower leg

Innervation of Gastrocnemius

Tibial nerve

Origin of Tibialis anterior

Lateral tibial condyle, proximal tibial shaft

Insertion of Tibialis anterior

Medial cuneiform (medial tarsal in 1st row) and 1st metatarsal

Action of Tibialis anterior

Dorsiflexes foot

Innervation of Tibialis anterior

Deep fibular nerve