Pharyngeal Arch And Development Of The Face Cbc Anatomy Block Ii Unit Iii

Front 1

Origin of core mesoderm

Back 1

From invading neural crest cells (skeletal structures) and paraaxial mesoderm (muscular structures, endothelium of blood vessels)

Front 2

1st arch

Back 2

Most rostral arch (called mandibular arch, made up of maxillary and mandibular processes)

Front 3

Make up of pharyngeal apparatus

Back 3

pharyngeal arch
pharyngeal pouch
pharyngeal membrane
pharyngeal groove

Front 4

First Arch
Skeletal
Muscles
Nerve
BV

Back 4

Skeletal
- Meckel's cartilage (regresses)
-forms incus and malleus
-part of sphenomandibular ligament

Muscles
- Muscles of mastication
-Tensor Tympani
-Tensor Veli palatine
-Mylohyoid
-Anterior belly digastric

Nerve
-CN V3 (mandibular)

BV
-Maxillary Artery

Front 5

Second Arch
Skeletal
Muscles
Nerve
BV

Back 5

Skeletal
-Reichert's cartilage (regresses)
-styloid process
-stapes
stylohyoid ligament
-superior portion of hyoid bone

Muscles
-Facial expression
-Posterior belly digastric
-stylohyoid muscle
-Stepedius

Nerve
-Facial Nerve
CN VIII

BV
-Stapedial Artery

Front 6

Third arch
Skeletal
Muscles
Nerve
BV

Back 6

Skeletal
-Inferior portion of Hyoid bone
-Small laryngeal cartilages

Muscles
-Stylopharyngeus muscle

Nerve
-Glossopharyngeal nerve CN IX

BV
-Contribution to internal carotid artery

Front 7

Fourth and Sixth arches
Skeletal
Muscles
Nerve
BV

Back 7

Skeletal
-Laryngeal cartilages

Muscles
-Muscles of intrinsic larynx
-Muscles of soft palate and pharynx

Nerve
-Vagus nerve CNX

BV
Left side aortic arch
right side subclavian artery

Front 8

First pouch derivatives

Back 8

Elongates dramatically
Forms portion of tympanic cavity in middle ear
Auditory tube (nasal-pharyngeal tube) and inferior aspect of tympanic membrane

Front 9

Second pouch derivatives

Back 9

remains shallow pit
Forms tonsillar fossa (not tonsils)
eventually invaaded by lymphatic tissue (forming palatine tonsil)

Front 10

Third pouch derivatives

Back 10

Dorsal bud- forms inferior parathyroid glands
Ventral bud - forms thymus

Front 11

Fourth pouch derivatives

Back 11

Dorsal bud- forms superior parathyroids
Ventral bud- forms ultimobranchial body which invates thyroid to form parafollicular cells

Front 12

Fifth pouch derivatives

Back 12

Rudimentary, combines with 4th arch