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1

Anterior boundary of the anterior triangle of the neck

Midline of neck

2

Posterior border of the anterior triangle of the neck

Anterior border of sternocleidomastoid

3

Superior border of the anterior triangle of the neck

Inferior border of the body of mandible

4

What are the muscle groups of the anterior triangle of the neck?

-infrahyoid muscles
-suprahyoid muscles
-anterior vertebral muscles

5

Infrahyoid muscles

Thin, strap-like muscles
-sternohyoid
-sternothyroid
-thyrohyoid
-omohyoid

6

Where is the sternohyoid located?

Supercially, medial to superior belly of omohyoid

7

Origin of sternohyoid

Posterior surfaces of manubirum of sternum and eternal end of clavicle

8

Insertion of sternohyoid

Body of hyoid

9

Nerve supply of sternohyoid

Ansa cervicalis (C1-C3)

10

Action of sternohyoid

Depresses hyoid bone

11

Where is sternothyroid located?

Deep to sternohyoid

12

Origin of sternothyroid

Posterior surface of manubrium of sternum

13

Insertion of sternothyroid

Oblique line of thyroid cartilage

14

Nerve supply of sternothyroid

Ansa cervicalis (C1-C3)

15

Action of sternothyroid

Depresses larynx

16

Thyrohyoid

Upward continuation of sternothyroid

17

Origin of thyrohyoid

Oblique line of thyroid cartilage

18

Insertion of thyrohyoid

Runs superiorly over thyrohyoid membrane, inserts into greater horn and body of hyoid

19

Nerve supply for thyrohyoid

C1 fibers via hypoglossal nerve

20

Action of thyrohyoid

Depresses hyoid bone or elevates larynx

21

Ansa Cervicalis

-nerve loop that contains fibers from ventral rami of C1 to C3 spinal nerves

22

Lower root of ansa cervicalis

Direct branch of cervical plexus
-contains fibers from ventral rami of C2 and C3
-passes superficial (or deep) to internal vein
-joins upper root to form ansa

23

Upper root of ansa cervicalis

-appears to originate from hypoglossal nerve, but contains no hypoglossal fibers
-consists of C1 fibers that join CN XII and travel with it for a distance
-separate from CN XII and form upper root of ansa cervicalis
-joins lower root to form ansa

24

What does ansa cervicalis give branches to?

Sternohyoid
Sternothyroid
Both bellies of omohyoid

25

Some C1 fibers of ansa cervicalis do what?

Continue with CN XII (after it has given off upper root) and supply thyrohyoid and geniohyoid muscles

26

Suprahyoid muscles

-digastric
-stylohyoid
-mylohyoid
-geniohyloid

27

Digastric muscle

Consists of posterior and anterior bellies connected by an intermediate tendon

28

Posterior belly of digastric muscle

Attaches to digastric (mastoid) notch (medial to mastoid process), runs anteriorly and inferiorly, then becomes continuous with intermediate tendon

29

Intermediate tendon of digastric muscle

Pierces stylohyoid and runs in fibrous sling connected to body and greater horn of hyoid, then become continuous with anterior belly

30

Anterior belly of digastric muscle

Runs anteriorly and superiorly, then attaches to digastric fossa of mandible