Ch 4 Development Of Neck Flashcards
Primitive pharynx is formed from what
Anterior portion of foregut
Branchial apparatus or pharyngeal apparatus consists of
Branchial arches
Branchial grooves and membranes
Pharyngeal pouches
Branchial arches
Six pairs of U shaped bars with a core of mesenchyme
covered externally by ectoderm and
lined internally by endoderm
Each Branchial arch has its own developing
All within what?
Cartilage
Nerve
Vascular and muscular components
All Within each mesodermal core
1st or Mandibular arch of Branchial arches
Lower 1/3 of face
Cartilage:
meckels
Middle ear bones
Ligament of jaw
Ligament of middle ear
Muscles:
Mastication
Palatial muscles
Suprahyoid muscles
Nerve:
Trigeminal, 5th
2nd or HYOID arch of Branchial arches
Neck
Cartilage:
Reicherts cartilage
Middle ear bone
Process of temporal bone
Portions of hyoid
Ligament of hyoid
Muscles:
Facial expression
Middle ear
Suprahyoid
Nerve:
Facial, 7th
3rd
Of Branchial arches
Cartilage:
Unnamed
Portion of hyoid
Muscles:
Pharyngeal muscle
Nerve:
Glossopharyngeal, 9th
4th and 6th Branchial arch
Cartilage:
Unnamed
Laryngeal cartilage
Muscles:
Larynx and pharynx
Nerve:
Branches of vagus, 10th
Branchial grooves
1st groove forms
Last 4 are what, to make what smooth
Aka Pharyngeal grooves
External grooves found between Branchial arches
First groove forms external meatus
Last 4 grooves are obliterated (fuse together) to give neck a smooth contour
Branchial membranes
Develops into what
Double layered membrane, consists of ectoderm of Branchial groove and endoderm of Branchial pouch
Develops into tympanic membrane (eardrum)
*other membranes that appear in bottom of 4 Branchial grooves are temporary in embryo
Pharyngeal pouches
Develop from what
1 becomes
2..
3..
Develop as endodermal evaginations from lateral walls longing pharynx
1st pouch becomes auditory tubes and tympanic cavities (middle ear)
2nd pouch-palatine tonsillar tissue (lymphatic tissue)
3 and 4- thymus and parathyroid glands
