Master Muscle List

Question 1

Trapezius

Answer 1

Origin- superior nuchal line and ligament, occipital protuberance, C7-T12

Insertion- Lateral clavicle, acromion, spine of scapula

Action- scapular elevation, retraction, depression, rotation

Nerve- Spinal accessory nerve (CN XI - motor) and cervical nerves (C3-C4 - seansory)

Question 2

Latissimus Dorsi

Answer 2

Origin- T6-T12, thoracolumbar fascia, iliac crest, inferior 3-4 ribs

Insertion- bicipital groove of humerus

Action- Shoulder extension, adduction, and
medial rotation

Nerves- Thoracodorsal nerve
(C6, C7, C8)

Question 3

Infraspinatus

Answer 3

Origin- Infraspinatus
fossa of scapula

Insertion- Middle facet on
greater tubercle
of humerus

Action- Shoulder external rotation

Nerves- Suprascapular nerve
(C5 and C6)

Question 4

Deltoid

Answer 4

Origin- Anterior: lateral
third of clavicle
Middle:
Acromion
process
Posterior: Spine
of scapula

Insertion- Deltoid
tuberosity of
humerus

Action- Anterior: shoulder flexion and internal
rotation
Middle: shoulder abduction
Posterior: shoulder extension and
external rotation

Nerves- Axillary nerve (C5–C6)

Question 5

Levator Scapulae

Answer 5

Origin- C1-C4
transverse
processes- posterior tubercle

Insertion- Superior part of
the medial
border of scapula

Action- Scapular elevation and upward rotation

Nerves- Dorsal scapular (C5)
and cervical (C3–C4)
nerves

Question 6

Rhomboid Major

Answer 6

Origin- T2-T5 Spinous
processes

Insertion- Medial border of scapula

Action- Scapular retraction, Fix scapula to thoracic wall

Nerves- Dorsal scapular
nerve (C4–C5)

Question 7

Rhomboid Minor

Answer 7

Origin- Inferior nuchal
ligament
C7-T1 spinous
processes

Insertion- Medial border of scapula

Action- Scapular retraction, Fix scapula to thoracic wall

Nerves- Dorsal scapular
nerve (C4–C5)

Question 8

Supraspinatus

Answer 8

Origin- Supraspinous
fossa of scapula

Insertion- Greater tubercle
of humerus

Action- Shoulder abduction

Nerves- Suprascapular nerve (C4, C5, and C6)

Question 9

iliocostales

Answer 9

Origin- Iliac crest, posterior
sacrum, sacral
and inferior
lumbar spinous
processes,
supraspinous
ligament

Insertion- Lower ribs and
cervical transverse processes

Action- Lateral flexion and extension of spine

Nerves- Posterior rami of
spinal nerves

Question 10

Longissimus

Answer 10

Origin- Iliac crest,
posterior
sacrum, sacral
and inferior
lumbar spinous
processes,
supraspinous
ligament

Insertion- Transverse
processes in thoracic and cervical regions, Mastoid process of temporal bone

Action- Lateral flexion and extension of spine

Nerves- Posterior rami of
spinal nerves

Question 11

Spinalis

Answer 11

Origin- Iliac crest,
posterior
sacrum, sacral
and inferior
lumbar spinous
processes,
supraspinous
ligament

Insertion- Spinous
processes in upper thoracic region and skull

Action- Lateral flexion and extension of spine

Nerves- Posterior rami of
spinal nerves

Question 12

Subscapularis

Answer 12

Origin- subscapular fossa

Insertion- lesser tubercle of humerus

Action- shoulder internal rotation, shoulder adduction

Nerves- Upper and lower
subscapular nerves
(C5, C6, and C7)

Question 13

Teres Major

Answer 13

Origin- Inferior angle of
scapular- posterior surface

Insertion- Lesser tubercle of humerus- medial
lip of bicipital groove

Action- Shoulder adduction and internal rotation

Nerves- Lower subscapular
nerve (C6 and C7)

Question 14

Teres Minor

Answer 14

Origin- Lateral border
of scapula (superior part)

Insertion- Greater tubercle
of humerus- inferior facet

Action- Shoulder external rotation

Nerves- Axillary nerve (C5
and C6)

Question 15

Semispinalis Capitis

Answer 15

Origin- Nuchal ligament
C7-T6 spinous process

Insertion- Mastoid process of temporal bone, Lateral third of superior nuchal line of occipital bone

Action- Lateral flexion of the neck, neck rotation,
neck extension

Nerves- Posterior rami of
spinal nerves

Question 16

Splenius Cervicis

Answer 16

Origin- Nuchal ligament
C7-T6 spinous process

Insertion- C1-C4 transverse processes

Action- Lateral flexion of the neck, neck rotation,
neck extension

Nerves- Posterior rami of
spinal nerves

Question 17

Quadratus Lumborum

Answer 17

Origin- Lumbar
transverse processes, medial half of inferior border of 12th rib

Insertion- Iliolumbar
ligament and iliac crest

Action- Extension and lateral flexion of the spine

Nerves- T12, L1-L4