Anterior muscles :
→ Superficial :
- ① Platysma m.
- O : skin of infra / supraclavicular
- I : → infer. border of mandible → lower lip → angle of mouth
- N: Facial n. (cervical branch)
- F: Depress of the mandible
- B.S : submental + suprascapular art.
- ② Sternocleidomastoid
- O : sternum -manubrium + clavicle -sternal part.
- I : mastoid process + nuchal line
- N : accessory nerve + spinal n.
- F: flexion of the head
- B.S : External carotid artery + sup. thyroid art.
→ Suprahyoid muscles : F: elevates the hyoid bone.
- ① Digastric
- O: Ant. belly : digastric fossa of the mandible
- Post. belly : mastoid notch
- I: together by tendon
- N: Ant. belly : mylohyoid
- Post. belly : facial n
- B.S : Submental artery (of the facial art.)
- ② Stylohyoid
- O: styloid process
- I: hyoid bone
- N: Facial n
- B.S : branches of the external carotid artery.
- ③ Mylohyoid m.
- O: mandible -mylohyoid line.
- I: hyoid bone
- N: mylohyoid n. (mandibular)
- B.S: mylohyoid art.
- ④ Geniohyoid : *
- O: inferior mental spine
- I: hyoid bone
- N: hypoglossal n.
- B.S : Sublingual branch of lingual art.
→ Infrahyoid muscles : F: depress hyoid bone
- ① Sternohyoid
- O: sternum
- I: hyoid bone
- B.S : lingual & superior thyroid art.
- ② Sternothyroid
- O: Sternum
- I: thyroid cartilag
- B.S : Sup. thyroid arts.
- ③ thyrohyoid m.
- O: thyroid cartilage -oblique line
- I: hyoid bone
- B.S : Superior thyroid art. (from External carotid art.)
- ④ Omohyoid m.
- O: Sup. belly : hyoid bone
- Inf. belly : scapula
- I: together by tendon
- B.S : superior thyroid art. + inf. " " (from thyrocervical trunk)
N: Cervical ansa