Anatomical Triangles

Question 1

What are the borders of the anterior triangle of the neck?

Answer 1

Base: inferior surface of mandible

Lateral: anterior border SCM

Medial: imaginary midline of neck

Apex: jugular notch in sternum

Question 2

What are the borders of the posterior triangle of the neck?

Answer 2

Base: clavicle

Anterior: posterior border SCM

Posterior: anterior border upper traps

Question 3

What are the contents of the posterior triangle of the neck?

Answer 3

Scalenes
Levator scapulae

Brachial plexus (roots and trunks)
Cervical plexus (branches)
Phrenic nerve
CN XI spinal accessory nerve

Subclavian artery

Question 4

What are the contents of the anterior triangle of the neck?

Answer 4

• Suprahyoid & infrahyoid muscles
• Carotid arteries (common, internal and external)
• thyroid gland