Learn Extremity 3 Muscles by StudyGallery.com

Extremity 3

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Abductor Digiti Minimi
Digiti indicates fingers

O: pisiform
I: base of the pinky finger
A: Abduction of pinky
Wikipedia Questions

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Abductor Pollicis Brevis
Pollicis for thumb
Brevis is short

O: scaphoid and trapezium
I: base of thumb
A: Abducts the thumb
Wikipedia Questions

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Abductor Pollicis Longus
Pollicis for thumb
Longus for long

O: middle radius ulna
I: Thumb
A: abduction, extension of thumb
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Adductor Pollicis
Pollicis for thumb

O: bases of 2nd and 3rd metacarpals
I: Medial side of base of proximal phalanx of thumb
A: Draws 1st metacarpal laterally to oppose thumb toward center of palm and rotates it medially
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Anconeus

O: Humerus
I: ulna
A: Stabilises the elbow and abducts the ulna during pronation
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Biceps Brachii Short
Brach- for arm

O: tip of coracoid process of scapula
I: Tuberosity of radius and fascia of forearm via bicipital aponeurosis
A: Supinates forearm and, when it is supine, flexes forearm
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Biceps Femoris – Short Head

O:
I: Primarily on fibular head; also on lateral collateral ligament and lateral tibial condyle
A: Flexes the knee, and also rotates the tibia laterally; long head also extends the hip joint
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Brachialis
Brach- for arm

O: Middle of humerus
I: Coronoid process and tuberosity of ulna
A: Major flexor of forearm -- flexes forearm in all positions
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Brachioradialis
Brach- for arm
Radialis for forearm

O: Humerus
I: Radius
A: flexes forearm
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Coracobrachialis
Brach- for arm

O: Tip of coracoid process of scapula
I: Middle third of medial surface of humerus
A: Helps to flex and adduct arm
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Deltoid

O: shoulder
I: Deltoid tuberosity of humerus
A: Anterior part: flexes and medially rotates arm; Middle part: abducts arm; Posterior part: extends and laterally rotates arm
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Extensor Digitorum Longus

O: Lateral top of tibia
I: Splits into 4 tendon slips after inferior extensor retinaculum, each of which insert on dorsum of middle and distal phalanges as part of extensor expansion complex
A: Extend toes 2 - 5 and dorsiflexes ankle
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Extensor Hallucis Longus

O: mid fibula
I: Base and dorsal center of distal phalanx of great toe
A: Extends great toe and dorsiflexes ankle
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Gastrocnemius

O: Back of base femur
I: The two heads unite into a broad aponeurosis which eventually unites with the deep tendon of the soleus to form the Achilles tendon, inserting on the middle 1/3 of the posterior calcaneal surface
A: Powerful plantar flexor of ankle
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Gluteus Maximus

O:
I: Primarily in fascia lata at the iliotibial band; also into the gluteal tuberosity on posterior femoral surface
A: Major extensor of hip joint, assists in laterally rotating the thigh; upper and middle third section of the muscle are abductors Questions

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Gluteus Medius

O:
I: Lateral and superior surfaces of greater trochanter
A: Major abductor of thigh; anterior fibers help to rotate hip medially; posterior fibers help to rotate hip laterally Questions

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Gluteus Minimus

O:
I: Anterior surface of greater trochanter
A: Abducts and medially rotates the hip joint Questions

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Gracilis

O: Pelvis pubic
I: Medial surface of tibial shaft, just posterior to sartorius
A: Flexes the knee, adducts the thigh, and helps to medially rotate the tibia on the femur
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Pectoralis Major

O:
I: Lateral lip of intertubercular groove of humerus
A: Adducts and medially rotates humerus; draws scapula anteriorly and inferiorly; Acting alone: clavicular head flexes humerus and sternocostal head extends it
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Pectoralis Minor

O:
I: Medial border and superior surface of coracoid process of scapula
A: Stabilizes scapula by drawing it inferiorly and anteriorly against thoracic wall
Wikipedia Questions