Embryo Handout - Jake Prieto

Head & Neck Exam 1

What nerve is associated with Arch I (maxillary & mandibular processes)?

CN V (Trigeminal Nerve)

Arch I (maxillary & mandibular processes) — Muscles (8)

Muscles of mastication:

• Masseter — elevates the mandible

• Temporalis — elevates and retracts the mandible

• Medial Pterygoid — elevates and assists in side-to-side movement of the mandible

• Lateral Pterygoid — protrudes and assists in side-to-side movement of the

.

1. Mylohyoid m.

2. Anterior digastric m.

3. Tensor tympani m.

4. Tensor veli palatini m.

Arch I (maxillary & mandibular processes) — Bone / cartilage (7)

1. Maxilla,

2. Zygomatic,

3. Temporal (part),

4. Mandible,

5. Malleus,

6. Incus,

7. Sphenomandibular ligament

What processes are included in Arch I? (2)

maxillary & mandibular processes

What nerve is associated with Arch II?

CN VII (Facial Nerve)

What muscles are derived from Arch II?

Muscles of facial expression:

(occipitofrontalis, platysma, and auricular muscles)

.

Posterior digastric muscle

Stylohyoid muscle

Stapedius muscle

What bone / cartilage structures are derived from Arch II?

1) Stapes

2) Styloid process

3) Stylohyoid ligament

4) Hyoid (part)

What nerve is associated with Arch III?

Glossopharyngeal (CN - 9

What muscle is associated with Arch III?

Stylopharyngeus m.

What bone / cartilage structure is associated with Arch III?

Hyoid (part)

What nerve is associated with Arch IV, VI?

CN X (Vagus Nerve)

What muscles are associated with Arch IV, VI? (6)

1. Laryngeal muscles

2. Levator veli palatini

3. Pharyngeal constrictor muscles

What bone / cartilage structures are associated with Arch IV, VI?

Laryngeal cartilages

What structure is derived from Cleft 1?

External Auditory

What structures are derived from Pouch 1? (2)

Auditory tube, middle ear

What structure is derived from Pouch 2?

Palatine tonsil

What structures are derived from Pouch 3? (2)

Thymus & inferior parathyroid glands

What structure is derived from Pouch 4?

Superior parathyroid glands

Which pharyngeal arch gives rise to the Malleus and Incus?

Arch I (maxillary & mandibular processes)

Which pharyngeal arch gives rise to the Stapes?

Arch II

Which pharyngeal arch gives rise to the Sphenomandibular ligament?

Arch I (maxillary & mandibular processes)

Which pharyngeal arch gives rise to the Styloid process and Stylohyoid ligament?

Arch II

Which pharyngeal arch gives rise to the Levator veli palatini?

Arch IV, VI

Which pouch gives rise to the Palatine tonsil?

Pouch 2

Which pouch gives rise to the Thymus, inferior parathyroid glands?

Pouch 3