Lab 9

Question 1

Describe the clavicle.

Answer 1

1. S-shaped
2. Sternal end
3. Acromial end
4. Superior is smooth
5. Inferior is rough

Question 2

Describe the three borders of the scapula.

Answer 2

1. Medial (vertebral)
2. Lateral (axillary)
3. Superior

Question 3

Describe the four main features of the scapula.

Answer 3

1. Acromion
2. Coracoid
3. Glenoid fossa
4. Spine

Question 4

What are the three fossae of the scapula?

Answer 4

1. Supraspinatus fossa
2. Infraspinatus fossa
3. Subspinatus fossa

(One and two are divided by the spine of the scapula and also contains a suprascapular notch)

Question 5

Describe the eleven features of the humerus and where they are located.

Answer 5

1. Head
2. Anatomical
3. Surgical neck
4. Greater tubercle (lateral)
5. Leser tubercle (medial)
6. Capitulum (ulna)
7. Trochlea (ulna)
8. Coranoid fossa (anterior)
9. Radial fossa
10. Olecranon fossa (posterior)
11. Medial and lateral epicondyles

Question 6

Name the three features of the radius and where they are.

Answer 6

1. Radial head (proximal)
2. Styloid process (carpals)
3. UInar notch

Question 7

Name the six features of the ulna and where they are.

Answer 7

1. Olecranon process (posterior)
2. Trochlear notch
3. Coronoid process (anterior)
4. Head (distal)
5. Radial notch (proximal)
6. Styloid process

Question 8

How many carpal bones do we have and what kind of joint do they posses?

Answer 8

We have eight carpal bones with gliding joints.

Question 9

How many metacarpals do we have and what joint do they posses?

Answer 9

We have five metacarpals with condylar joints.

Question 10

How many phalanges do we have and what are the three sections called?

Answer 10

We have fourteen phalanges and the three sections are proximal. middle, and distal.

Question 11

What are the two muscles that move the humerus anteriorly?

Answer 11

1. Pectoralis major

Origin: Clavicle and sternum

Insertion: Bicipital groove and deltoid tuberosity

Function: Medial rotation and adduction of the humerus

2. Deltoid

Origin: Lateral clavicle, acromion process of the scapula, and scapular spine

Insertion: Deltoid tuberosity

Function: Flexion, medial rotation, abduction, and extension of the humerus.

Question 12

What muscle moves the humerus posteriorly?

Answer 12

Latissimus Dorsi

Origin: Lower spine, iliac crest, inferior angle of the scapula, and lower three or four ribs

Insertion: Bicipital groove

Function: Adducts and medially rotates the humerus.

Question 13

What muscle moves the forearm anteriorly?

Answer 13

Biceps brachii

Origin: Long head originates from the at the supraglenoid tubercle and the short head originates from the coracoid process.

Insertion: Inserts onto the radial tuberosity

Function: Supinates and flexes forearm.

Question 14

What muscle moves the forearm posteriorly?

Answer 14

Triceps brachii

Origin: Long head originates from the infraglenoid tubercle, medial head originates from the posterior surface of the humerus, lateral head originates from the posterior surface of the humerus

Insertion: Olecranon process of the ulna

Function: Extend the forearm

Question 15

What are the two flexor muscles that move the hand and fingers?

Answer 15

Palmaris Longus

Origin: Medial epicondyle of the humerus

Insertion: Skin of palm

Function: Flexor (weak)

Pronator Teres

Origin: Medial epicondyle

Insertion: Mid-lateral radius

Function: Pronation

Question 16

What muscle extends the hand and fingers?

Answer 16

Extensors of the Superficial Group

Origin: Lateral epicondyle

Insertion: Wrist, palm, and fingers

Function: Extends the hand and fingers