Upper limb muscles

Question 1

deltoid

Answer 1

Origin : Clavicular part –
unipennate
(b) Acromial part –
multipennate
(c) Spinous part –
unipennate
• Anterior aspect of
lateral 1/3rd of clavicle
• Lateral border of
acromion
• Lower lip of the spine
of scapula
Insertion : deltoid tuberosity of humerus
NS : axillary nerve
Action : flexion and medial rotation by the anterior fibres.
abduction by middle F
extension and medial rotation by post F

Question 2

Pectoralis major

Answer 2

Pectoralis major muscle is thin fan shaped and arises by two
heads, viz.
1. Small clavicular head.
2. Large sternocostal head.
Clavicular head—arises from the medial half of the anterior
aspect of the clavicle.
Sternocostal head—arises from the (a) lateral half of
the anterior surface of the sternum, up to 6th costal
cartilage, (b) medial parts of 2nd–6th costal cartilages,
and (c) aponeurosis of the external oblique muscle of the
abdomen.
Insertion : U shaped tendon on the lateral lip of the bicipital groove.
nerve supple is by lateral and medical pectoral nerves.

Question 3

pectoralis minor

Answer 3

Origin
It arises from 3rd, 4th, and 5th ribs, near their costal
cartilages.
Insertion
It is inserted by a short thick tendon into the medial border
and upper surface of the coracoid process of the scapula.
Nerve Supply
Nerve supply is by medial and lateral pectoral nerves.