Muscles Of Back And Pectoral Region

Question 1

Shape of Trapezius

Answer 1

Triangular

Question 2

Nerve supply to Trapezius

Answer 2

Spinal Part of Accessory Nerve

Question 3

Action of Trapezius

Answer 3

1. Elevation of Scapula (along with Levator Scapulae)
2. Retraction of Scapula (along with Rhomboid Major and Minor)
3. Overhead abduction of Shoulder joint (along with Serratus anterior)

Question 4

0 - 15 degree Abduction of Shoulder Joint is done by

Answer 4

Supraspinatus

Question 5

15 - 90 degree Abduction of Shoulder Joint is done by

Answer 5

Middle / Acromial Fibres of Deltoid Muscle

Question 6

90 - 180 degree of Abduction of Shoulder Joint is done by

Answer 6

Trapezius + Serratus anterior

i.e; Overhead abduction of Shoulder Joint

Question 7

Abduction of Shoulder Joint involves

By degree

Answer 7

Gleno-Humeral Elevation - 120°

Scapular Rotation - 60°

i.e; 2 : 1

Question 8

Levator scapulae is supplied by

Answer 8

1. C3 - C4

2. C5 — Dorsal scapular nerve

Question 9

Rhomboid Major and Minor supplied by

Answer 9

C5 — Dorsal Scapular Nerve

Question 10

Triangle of Auscultation; Boundaries

Medially -

Laterally -

Base -

Answer 10

Medially - Trapezius

Laterally - Medial Border of Scapula

Base - Latissimus dorsi

Question 11

Triangle of Auscultation is used for

Answer 11

Auscultation of Lower lobe of Lung sound and Cardiac Orifice

Question 12

Boundaries for Lumbar Triangle of Petit

Anterior -

Posterior -

Base -

Answer 12

Anterior - External oblique muscle

Posterior - Latissimus dorsi

Base - Iliac Crest

Question 13

Lumbar triangle of Petit is Potential site for

Answer 13

Internal hernia

Question 14

Muscle forming the boundary for both Lumbar triangle of Petit and Triangle of auscultation

Answer 14

Lattisimus dorsi

Question 15

Actions of Serratus anterior

Answer 15

1. Protraction of Scapula (along with Pectoralis minor)

2. Overhead abduction of Shoulder (along with Trapezius)

Question 16

Nerve supply for Serratus anterior

Answer 16

C5, C6, C7 — Long thoracic nerve

Question 17

Root value of Long Thoracic Nerve-

Also known as

Answer 17

Nerve of Bell — C5, C6, C7

Question 18

Winging of Scapula is due to

Answer 18

Serratus anterior > Trapezius

Injury to Long Thoracic Nerve → Palsy of Serratus anterior

Question 19

Action of Lattisimus dorsi

Answer 19

Adduction

Medial Rotation

Extension

Question 20

Action of Pectoralis major

Answer 20

Adduction

Medial rotation

Flexion

Question 21

Teres major is supplied by

Answer 21

Lower Subscapular Nerve

Question 22

Subscapularis muscle is supplied by

Answer 22

Upper and Lower Subscapular Nerve

Branch of Posterior cord of Brachial Plexus

Question 23

Content of DeltoPectoral Groove

Answer 23

Cephalic Vein

Question 24

Clavipectoral fascia is present between

Answer 24

Clavicle and Pectoralis minor muscle

Question 25

Muscles enclosed by Clavipectoral fascia

Answer 25

Subclavius muscle and Pectoralis minor muscle

Question 26

Ligaments derived from the Clavipectoral Fascia

Answer 26

1. Suspensory ligament of Axilla - Gerdy’s Ligament

2. Costo-Coracoid ligament (1st costal cartilage to coracoid process)

Question 27

Structures piercing the Clavipectoral Fascia;

1.

2.

3.

Answer 27

1. Cephalic Vein
2. Lateral Pectoral Nerve
3. ThoracoAcromial Artery

Question 28

Action of Pectoralis minor muscle

Answer 28

Protraction of Scapula (along with Serratus anterior)

Pectoralis minor - No action at shoulder joint