1. ANTERIOR and POSTERIOR TRIANGLES of NECK
Gross HSB Reviewer
Courtesy of Katherine Joy N. Lumucso 1-A2
FEU-NRMF SY

2. Anterior Triangle of Neck

3. Submental Triangle Boundaries: Apex – Mandibular symphysis
bellies of Digastric muscle
Inferior – Body of hyoid bone
Floor – Mylohyoid muscle
Lateral – Right & left anterior
Contents:
Submental lymph nodes
Veins forming Anterior jugular vein

4. Submandibular or Digastric Triangle
Boundaries:
Lateral – Anterior & posterior bellies of Digastric muscle (1)
Superior – Inferior border of mandible (2)
Floor – Mylohyoid muscle (3), Hyoglossus muscle, and Middle constrictor of pharynx
Contents:
Submandibular gland & duct
CN XII, Nerve to mylohyoid
Submental artery
Submental lymph nodes
Suprahyoid muscles 1 2 3

5. Carotid Triangle Boundaries: Superior belly of Omohyoid muscle (1)
Posterior belly of Digastric muscle (2)
Anterior border of SCM (3)
Contents:
Carotid sinus
Carotid body
Carotid sheath (Common carotid artery, CN X, IJV)
Ansa cervicalis (supply Infrahyoid muscles) 2 3 1

6. Muscular Triangle Boundaries: Superior belly of Omohyoid muscle (1)
Anterior midline of the neck (2)
Anterior border of SCM (3) 1
Contents:
Infrahyoid muscles (Sternohyoid, Sternothyroid, Thyrohyoid, Omohyoid)
Viscera of neck (Thyroid gland, Parathyroid glands, Larynx) 2 3

7. Suprahyoid Muscles Mylohyoid Digastric (Anterior belly) Geniohyoid
Digastric (Posterior belly)
Stylohyoid

8. Infrahyoid Muscles Thyrohyoid Omohyoid (superior belly) Sternohyoid
Sternothyroid

9. 1 2
1 : Internal jugular vein 2 : Common carotid artery

10. Carotid Arteries External carotid artery Internal carotid artery
Common carotid artery

11. 3 1 2 1 : Omohyoid (superior belly) 2 : Sternohyoid
3 : SCM (reflected) 3 1 2

12. 2 1 3

13. 1 :
With ARROW:
Internal jugular vein

14. With RED PIN:
Sternohyoid muscle

15. With RED PIN:
Sternocleidomastoid muscle

16. With RED PIN:
Right common carotid artery

17. Posterior Triangle of Neck

18. Supra- clavicular Triangle
Occipital Triangle
Supra- clavicular Triangle

19. 1 : Trapezius
2 : Splenius capitis
3 : Levator scapulae
4 : Scalenus posterior
5 : Scalenus medius
6 : Omohyoid (inf. belly)
7a : SCM (sternal head)
7b : SCM (clavicular head)
8 : Brachial plexus
9 : R. Subclavian artery
10 : R. Subclavian vein
11 : Anterior triangle of neck 2 3 11 7a 5 4 6 7b 1 8 9 10

20. 1 : Trapezius
2 : Semispinalis capitis
3 : Splenius capitis
4 : Levator scapulae
5 : Scalenus medius
6 : Scalenus anterior
7 : SCM
8 : Parotid gland
9 : Parotid (Stensen’s)
duct 9 8 2 3 7 4 1 5 6

21. R. Anterior belly of Digastric
Stylohyoid
R. Posterior belly of Digastric
Thyrohyoid muscle
Omohyoid (superior belly)
Sternohyoid
Anterior jugular vein

22. 5 4 6
1 : Scalenus anterior
2 : Scalenus medius
3 : Scalenus posterior
4 : Levator scapulae
5 : Splenius capitis
6 : Thyrohyoid
7 : L. Common carotid artery
8 : Brachial plexus
9 : L. Subclavian artery
10 : L. Subclavian vein 7 2 1 3 8 10 9