Anterior Muscles

Question 1

Deltoid (O.I.A.N.)

Answer 1

O = Spine and Acromion process of Scapula
Lateral 1/3 of Clavicle

I = Deltoid Tuberosity of Humerus

A = Prime mover of arm abduction
Synergist in flexion
Extension of arm

N = Axillary Nerve

Question 2

Coracobrachialis (O.I.A.N.)

Answer 2

O = Coracoid Process of Scapula

I = Mid-medial shaft of Humerus

A = Arm flexion
Abduction

N = Musculocutaneus Nerve

Question 3

Serratus Anterior (O.I.N.)

Answer 3

O = Ribs 1-8 (or 9 )

I = Vertebral Border of Scapula (Ventral surface)

N = Long Thoracic Nerve

Question 4

Pectoralis Minor (O.I.N.)

Answer 4

O = Ribs 3-5 (ventral surface)

I = Coracoid Process of Scapula

N = Medial Pectoral Nerve

Question 5

Biceps Brachii (Long and Short Heads) (O.I.A.N.)

Answer 5

O = Long Head -> Supraglenoid Tubercle of Scapula
Short Head -> Coracoid Process of Scapula

I = Radial Tuberosity

A = Major forearm flexor
Supinates forearm
Weak flexor of arm

N = Musculocutaneous Nerve

Question 6

Brachialis (O.I.A.N.)

Answer 6

O = Anterior, distal surface of Humerus

I = Coronoid Process and Tuberosity of Ulna

A = Major forearm flexor

N = Musculocutaneous Nerve

Question 7

Brachioradialis (O.I.A.N.)

Answer 7

O = Lateral Epicondyle of Humerus

I = Styloid Process of Radius

A = Forearm Flexion

N = Radial Nerbe

Question 8

Iliopsoas Iliacus (O.I.A.N.)

Answer 8

O = Iliac Fossa of Os Coxa

I = Lesser Trochanter of Femur

A = Prime flexor of thigh
Postural muscle

N = Femoral Nerve

Question 9

Iliopsoas Psoas Major (O.I.A.N.)

Answer 9

O = Vertebrae T12-L5

I = Lesser Trochanter of Femur

A = Prime flexor of thigh
Postural muscle

N = Spinal Nerves L1-L3

Question 10

Sartorius (O.I.A.N.)

Answer 10

O = Anterior superior Iliac Spine

I = Medial proximal Tibial Shaft (near tibial tuberosity)

A = Flexion and Lateral Rotation of Thigh
Flexion of Lower Leg

N = Femoral Nerve

Question 11

Rectus Femoris (O.I.A.N.)

Answer 11

O = Anterior inferior Iliac Spine
Superior Margin of Acetabulum

I = Patella via Quadriceps Tendon

A = Thigh flexion
Lower leg extension

N = Femoral Nerve

Question 12

Vastus Lateralis (O.I.A.N.)

Answer 12

O = Greater Trochanter
Linea Aspera of Femur

I = Patella via Quadriceps Tendon

A = Lower leg extension
Stabilizes Patella

N = Femoral Nerve

Question 13

Vastus Medialis (O.I.A.N)

Answer 13

O = Linea Aspera of Femur

I = Patella via Quadriceps Tendon

A = Lower leg extension
Stabilizes Patella

N = Femoral Nerve

Question 14

Vastus Intermedius (O.I.A.N.)

Answer 14

O = Proximal anterolateral Femoral Shaft

I = Patella via Quadriceps Tendon

A = Lower Leg Extension

N = Femoral Nerve

Question 15

Tensor Fasciae Latae (O.I.A.N)

Answer 15

O = Anterior aspect of Iliac Crest
Anterior Superior Iliac Spine

I = Iliotibial Tract

A = Abduction and Flexion of Thigh

N = Superior Gluteal Nerve

Question 16

Pectineus (O.I.A.N)

Answer 16

O = Pubis of Os Coxa

I = Pectineal Line of Femur

A = Adduction and Flexion of Thigh

N = Femoral Nerve

Question 17

Gracialis (O.I.A.N)

Answer 17

O = Ramus and Body of Pubis

I = Medial proximal Tibial Shaft

A = Adducts thigh
Flexes and medially rotates legs

N = Obturator Nerve (L2 and L3)

Question 18

Adductor Longus (O.I.A.N)

Answer 18

O = Inferior Ramus of Pubis

I = Linea Aspera of Femur

A = Adduction and medial rotation of thigh (when thigh flexed)

N = Obturator Nerve and Sciatic Nerve (tibial division)

Question 19

Adductor Magnus (O.I.A.N)

Answer 19

O = Ischial and Pubic Rami
Ischial Tuberosity

I = Linea Aspera of Femur

A = Extension
Adduction
Medial rotation of thigh (when thigh flexed)

N = Obturator Nerve and Sciatic Nerve (tibial division)

Question 20

Pectoralis Major (O.I.A.N)

Answer 20

O = Sternocostal head -> Sternum and Costal Cartilages 2-6
Clavicular head -> Clavicle

I = Greater tubercle of Humerus

A = Prime mover of arm flexion; addiction and medial rotation of arm

N = Medial and Lateral Pectoral Nerve