Lab 9 - Muscles of the Upper Body

Question 1

Origin vs insertion

Answer 1

Origin - Attachment point that does NOT during contraction

Insertion - Attachment point that DOES move during contraction

Question 2

Swimmer’s muscle

Answer 2

Latissimus dorsi

Question 3

Flexor retinaculum 2 functions

Answer 3

1. Anchors tendons to the wrist
2. Prevents tendons from pulling away when hand is flexed

Question 4

Palmaris longus

Answer 4

Absent in 10% of population. Superficial, flexes hand. Inserts into palmar aponeurosis

Question 5

Where do most hand extensors originate?

Answer 5

Lateral epicondyle or lateral supracondylar ridge of humerus

Question 6

What 2 muscles are the scalenes bound by?

Answer 6

1. Sternocleidomastoid in front
2. Levator scapulae in back