Posterior triangles of the neck

Question 1

Sternocleidomastoid muscle divides neck into

Answer 1

ant and post triangles

Question 2

Posterior triangle

Answer 2

Mm sternocleidomast, trapezius
- Occipital Δ
- Supraclavicular Δ

Question 3

Question 4

Cross-section through the deep cervical fascia

Question 5

deep cervical fascia consists of 3 layers

Answer 5

Superficial layer of the deep fascia (investing layer)
Prevertebral layer of the fascia
Pretracheal fascia

Question 6

Deep cervical fascia also contains the carotid sheath

Question 7

Vertical organization

Question 8

Carotid sheath contains:

Answer 8

Common and internal carotid artery
Internal jugular vein
Vagus nerve
Deep cervical lymph nodes

Question 9

Retropharyngeal space

Answer 9

Potential space
Between visceral part of pre- vertebral fascia and buccopharyngeal fascia

Question 10

Question 11

Sternocleidomastoid muscle nerve supply

Answer 11

Spinal accessory nerve (CNXI) + C3 and C4

Question 12

Sternocleidomastoid muscle
Unilateral contraction

Answer 12

Laterally flexes neck
Rotates

Question 13

Sternocleidomastoid muscl
Bilateral contraction

Answer 13

Extends neck AO joint
Flexes neck

Question 14

Divides neck into anterior and lateral cervical regions

Answer 14

Sternocleidomastoid muscle

Question 15

Lateral cervical regions

Answer 15

– where we find ant and post triangles of the neck

Question 16

Sternocleidomastoid muscle has two heads:

Answer 16

Sternal head
Clavicular head

Question 17

Sternal head

Answer 17

– Rounded tendon attaches to the manubrium

Question 18

Clavicular head

Answer 18

• Thick fleshy – attaches to the surface of the medial third of the clavicle

Question 19

The two heads of the sternocleidomastoid muscle are separated inferiorly by a space, visibly superficial as a small triangular depression

Answer 19

= lesser supraclavicular fossa

Question 20

The heads of the sternocleidomastoid muscle join superiorly as they

Answer 20

pass obliquely upwards towards the cranium

Question 21

Sternocleidomastoid muscle
Superior attachment:

Answer 21

Mastoid process of temporal bone and superior nuchal line of occipital bone

Question 22

Investing layer of deep cervical fascia splits to form a sheath

Answer 22

= sternocleidomastoid muscle

Question 23

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Question 25

Question 26

Question 27

Question 28