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29 Cards in this Set
- Front
- Back
What are the components of the pharyngeal foregut?
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1) stomedeum
2) oropharyngeal membrane 3) Branchial Apparatus |
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What is the stomedeum?
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primitive mouth cavity
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What is the oropharyngeal membrane?
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Bilaminar membrane with ectoderm on the outside and endoderm on inside.
Breaks down about 26th day to give cranial foregut |
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Branchial Apparatus
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develops around cranial foregut
development begins in 4th week cranial caudal development |
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Neural Crest Mesenchyme
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proliferation of neural crest tissues gives rise to the pharyngeal arches
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What are the components of Arch 1?
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mandibular notch
maxillary prominence mandibular prominence |
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What are the branchial grooves?
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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 |
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what are pharyngeal pouches?
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out pockets of gut tube lined with endoderm of the foregut
inside the grooves lie caudal to arch |
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what are branchial membranes?
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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 |
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What is the adult derivative of groove 1?
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external auditory meatus
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What is the adult derivative of membrane 1?
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Tympanic membrane
consists of surface ectoderm, intervening mesoderm and endoderm of pharyngeal pouch 1 |
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Operculum(cervical sinus)
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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 |
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Aortic Arch 1 derivative?
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maxillary
external carotid arteries |
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Aortic Arch 2
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Stapedial artery
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Aortic Arch 3
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common carotid
proximal internal carotid |
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Aortic Arch 4
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left- aortic arch
right- subclavian |
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Aortic Arch 5
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regression
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Aortic Arch 6
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left- proximal left pulmonary artery
ductus arteriosus right-proximal right pulmonary artery |
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Which tissue are the cartilage bars from?
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neural crest
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Cartilage arch 1
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mandibular prominence
1)dorsal-malleus and incus 2)ventral- template for mandible 3)perichondrium-sphenomandibular ligament |
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Cartilage arch 2
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Rickerts Cartilage
Dorsal-stapes,styloid process,stylohyoid ligament Ventral-lesser horn of hyoid, upper part of body |
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Cartilage arch 3
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lower horn of body and greater horn of hyoid
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Cartilage arches 4,6
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all cartilage of larynx
except: epiglottis |
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Arch 1 nerve and muscle
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Trigeminal N
Muscles: Mastication Mylohyoid Anterior Belly Digastric Tensor Tympani Tensor Veli Palatini |
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Arch 2 nerve and muscle
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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 |
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Arch 3 nerve and muscle
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glossopharyngeal nerve
parasympathetics parotid gland via lesser petrosal nerve and otic ganglion muscles stylopharyngeus muscle |
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Arch 4 nerve and muscle
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Vagus Nerve
Superior laryngeal Pharyngeal branch of vagus Muscles upper pharyngeal muscles cricothyroid muscle |
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Arch 6 nerve and muscle
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vagus
recurrent laryngeal nerve muscles lower pharyngeal muscles and all remaining muscles of the larynx |
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Muscles of the operculum
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accessory nerve
muscles Sternocleidomastoid Trapezius |