Lab practical 2

Question 1

Biceps brachii

Answer 1

Origins:
- Long head: glenoid cavity of the scapula
- Short head: coracoid process of the scapula

Insertion:
- Radial tuberosity of the radius

Action:
- Flexion of the elbow joint

Question 2

Triceps brachii

Answer 2

Origins:
- Long head: glenoid cavity of the scapula
- Lateral and medial heads: posterior surface of the humerus

Insertion:
- Olecranon process of the ulna

Action:
- Extensor of the elbow joint

Question 3

External abdominal oblique

Answer 3

Origin:
- External surface of lower 8 ribs

Insertion:
- Anterior half of the iliac crest and linea alba

Action:
- Compresses abdomen

Question 4

Trapezius

Answer 4

Origins:
- Occipital bone
- Ligamentum nuchae
- Spinous process of C7-T12

Insertions:
- Lateral end of the clavicle
- Acromion process of the scapula
- Spine of the scapula

Action:
- Extension of the neck

Question 5

Deltoid

Answer 5

Origins:
- Lateral end of the clavicle
- Acromion process of the scapula
- Spine of the scapula

Insertion:
- Deltoid tuberosity of the humerus

Action:
- Abduction of the glenohumeral joint

Question 6

Temporalis

Answer 6

Origins:
- Temporal fossa of the temporal bone

Insertion:
- Coronoid process of the mandible

Action:
- Elevation of the temporomandibular joint

Question 7

Gastrocnemius

Answer 7

Origins:
- Medial and lateral condyles of the femur

Insertion:
- Calcaneus

Action:
- Plantar flexion of the ankle joint

Question 8

Rectus femoris

Answer 8

Origins:
- Anterior inferior iliac spine of the ilium
- Acetabulum of the os coxa

Insertion:
- Patella

Action:
- Extension of the knee joint