Laboratory 23: Muscles of the Shoulder, Chest and Upper Limb

Question 1

Where do many of the chest and shoulder muscles insert? What does it provide?

Answer 1

On the scapula and provide various movements of the pectoral girdle.

Question 2

What are muscles located in the arm responsible for?

Answer 2

Muscles located in the arm having insertions on the radius and ulna are responsible for forearm movements at the elbow joint.
Muscles located in the forearm with insertion on carpals, metacarpals, or phalanges are responsible for various movements of the hand.

Question 3

What do the large size muscles of the upper limb provide?

Answer 3

Powerful actions.

Question 4

What do the smaller size muscles of the upper limb provide?

Answer 4

The numerous smaller muscles in the forearm and hand allow finer motor skills.

Question 5

What does the human hand with its opposable thumb allow for?

Answer 5

The human hand, with it’s opposable thumb, enables us to grasp objects and provides great dexterity for tasks such as writing, drawing and playing musical instruments.

Question 6

What is the belly of a muscle?

Answer 6

The belly of a muscle responsible for a joint movement is usually proximal to the region being pulled.