L8-Shoulder region 1

Question 1

bones of the shoulder consists of?

Answer 1

clavicle and scapula that form pectoral girdle and the proximal end of the humerus

Question 2

superficial muscles of the shoulder?

Answer 2

trapezius and deltoid

Question 3

attachment related to trapezius?

Answer 3

trapezius attaches the clavicle and scapula to the trunk

Question 4

attachment related to deltoid?

Answer 4

deltoid attaches the scapula and clavicle to the humerus

Question 5

what are 3 muscles that attaches the scapula to the vertebral column

Answer 5

levator scapulae
rhomboid major
rhomboid minor

Question 6

mention the origin insertion nerve supply and action of pectoralis major muscle

Answer 6

originates from the front of the trunk and insertion is the bicipital groove of humerus. supplied by the medial and lateral pectoral nerves. it is responsible for the flexion abduction and medial rotation of the shoulder

Question 7

mention the origin insertion nerve supply and action of pectoralis minor muscle

Answer 7

originates from the front of the trunk and insertion is coracoid process. it is supplied by the medial pectoral nerve. it is responsible for the protraction of the scapula and depression of the shoulders

Question 8

mention origin nerve supply and action of subclivius muscle

Answer 8

originates from the front of the trunk and it is supplied by the nerve to subclivius. it is responsible for steadying of the clavicle and fixing it to the first rib

Question 9

mention the origin insertion nerve supply and action of deltoid muscle

Answer 9

originates from the spine of scapula acromion and clavicle and insertion is deltoid tuberosity. it is supplied by the axillary nerve. anterior fibres: flexion and medial rotation of the humerus
middle fibres: abduction
posterior fibres: extension and lateral rotation

Question 10

mention the origin insertion nerve supply and action of trapezius muscle

Answer 10

originates form the cervical and upper thoracic spines and insertion is spine of scapula acromion and clavicle. it is supplied by the spinal accessory nerve
upper fibers: elevation of the shoulder
lower fibres: depression of the scapula
middle fibres:retracts the shoulder

Question 11

mention the origin insertion nerve supply and action of latissmus dorsi muscle

Answer 11

originates from the lower part og the back and insertion is biciptal groove. it is supplied by the nerve to latissmus dorsi. it is responsible for extension adduction and medial rotation of the arm also involved in climbing and swimming

Question 12

mention the origin insertion and nerve supply of levator scapulae rhomboid minor and rhomboid major

Answer 12

originates from the middle of the upper part of the back and insertion is the back of medial boarder of scapula it is supplied by dorsal scapular nerve it retracts the scapula rotates the scapula so that glenoid cavity faces downwards

Question 13

cause of flattening shoulder?

Answer 13

paralysis of deltoid muscle due to injury of the axillary

Question 14

outcome of paralysis of trapezius muscle

Answer 14

leads to a drop of the shoulder with rotation of the angle of the scapula towards the midline restricting abduction of the arm

Question 15

what is the main cause of paralysis if the trapezius muscle?

Answer 15

injury to spinal accessory muscle because its superficial location in the posterior triangle of the neck makes it very vulnerable to injury