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29 Cards in this Set

  • Front
  • Back
What are the components of the pharyngeal foregut?
1) stomedeum
2) oropharyngeal membrane
3) Branchial Apparatus
What is the stomedeum?
primitive mouth cavity
What is the oropharyngeal membrane?
Bilaminar membrane with ectoderm on the outside and endoderm on inside.
Breaks down about 26th day to give cranial foregut
Branchial Apparatus
develops around cranial foregut
development begins in 4th week
cranial caudal development
Neural Crest Mesenchyme
proliferation of neural crest tissues gives rise to the pharyngeal arches
What are the components of Arch 1?
mandibular notch
maxillary prominence
mandibular prominence
What are the branchial grooves?
lie between the ridges
lie caudal to the arch from which they are named
lined with surface ectoderm
do not pass all the way through
what are pharyngeal pouches?
out pockets of gut tube lined with endoderm of the foregut
inside the grooves
lie caudal to arch
what are branchial membranes?
phrayngeal pouched prior to mesenchymal investment
occur when clefts and pouches approach each other
without mesenchyme membranes would break down due to their bilaminar structure
What is the adult derivative of groove 1?
external auditory meatus
What is the adult derivative of membrane 1?
Tympanic membrane
consists of surface ectoderm, intervening mesoderm and endoderm of pharyngeal pouch 1
Operculum(cervical sinus)
result of mesenchyme from the second arch growing over the sixth arch
entrapment of grooves 2-4 lead to the formation of a sinus
membranes 2-4 reinvaded by mesenchyme
Aortic Arch 1 derivative?
maxillary
external carotid arteries
Aortic Arch 2
Stapedial artery
Aortic Arch 3
common carotid
proximal internal carotid
Aortic Arch 4
left- aortic arch
right- subclavian
Aortic Arch 5
regression
Aortic Arch 6
left- proximal left pulmonary artery
ductus arteriosus
right-proximal right pulmonary
artery
Which tissue are the cartilage bars from?
neural crest
Cartilage arch 1
mandibular prominence
1)dorsal-malleus and incus
2)ventral- template for mandible
3)perichondrium-sphenomandibular ligament
Cartilage arch 2
Rickerts Cartilage
Dorsal-stapes,styloid process,stylohyoid ligament
Ventral-lesser horn of hyoid, upper part of body
Cartilage arch 3
lower horn of body and greater horn of hyoid
Cartilage arches 4,6
all cartilage of larynx
except: epiglottis
Arch 1 nerve and muscle
Trigeminal N
Muscles:
Mastication
Mylohyoid
Anterior Belly Digastric
Tensor Tympani
Tensor Veli Palatini
Arch 2 nerve and muscle
Facial Nerve
external ear sensation
middle ear sensation
taste via chorda tympani
parasympathetics:
submandibular and sublingual glands via chorda tympani
lacrimal gland via greater petrosal nerve, pterygopalatine ganglion
Muscles
facial expression
stylohyoid
posterior belly digastric
stapedius
Arch 3 nerve and muscle
glossopharyngeal nerve
parasympathetics parotid gland via lesser petrosal nerve and otic ganglion
muscles
stylopharyngeus muscle
Arch 4 nerve and muscle
Vagus Nerve
Superior laryngeal
Pharyngeal branch of vagus
Muscles
upper pharyngeal muscles
cricothyroid muscle
Arch 6 nerve and muscle
vagus
recurrent laryngeal nerve
muscles
lower pharyngeal muscles and all remaining muscles of the larynx
Muscles of the operculum
accessory nerve
muscles
Sternocleidomastoid
Trapezius