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Embryology of Ear, Nose, and

Paranasal Sinuses

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Ear Embryology

Internal ear

Medial ear

External ear

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Internal Ear

Otokista

In embryo aged + 22 day

Thickness of ectoderms surface in both of

rombencephalon side (Plakoda Ear) Invagination quickly; form otokista

Divided into:

o Ventral unsure: sacculus and ductus cochlearis

o Dorsal unsure: utriculus, canalis semicircularis,

and ductus endolymphaticus.

Structure of epithelial is form : membranose maze

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Medial Ear

Cavum tympanicFrom endoderm; from first sac pharynx

Grow quickly to lateral side; stick to the first floor ofthe cleft of the pharynx

Distal part (recessus tubotympanicus) : wide andform cavum tympanic primitive

Procsimal part : remains narrow and form audivitatube (Eustachius tube)

Osikula audicuso Malleus and incus from the first arch cartilage

pharynx

o Stapes from the second arch cartilage pharynx

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External Ear

Auricula

From six mesenchymal proliferation

In the dorsal end of the first and second pharyngeal arch

Meatus Acusticus Externus From dorsal part of the first pharyngeal cleft

Beginning of third month epithelial cells proliferate at the

bottom of this hole

Membranose Tympanic Created from:

(a) Epithelial layer of ectoderm in the base of meatus acusticus,

(b) Epithelial layer of endoderm on cavum tympanic

(c) Medial layer from connective tissue, create stratum fibroses

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Nose Embryology

Plakoda of the nose

Have invagination; create hole of the nose

Create ridge tissue that circle around eachof the hole; form a nose jut

In the edge lateral nasal swelling

Out the edge medial nasal swelling

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Paranasal Sinuses Embryology

Develop as diverticula lateral nasal wall

Extends into the maxillary bone, ethmoid

bone, frontal bone, and sphenoid bone

Reached a maximum area at the time of

puberty form a fixed face