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Embryo Head & Neck I
key terms/objectives
21
Medical
Professional
11/29/2010

Additional Medical Flashcards

 


 

Cards

Term

 

What is the stomadeum and what are its borders?

Definition

 

- a depression between the brain and the pericardium in an embryo, and is the precursor of the mouth and the anterior lobe of the pituitary gland.
- Boundaries

Cranial - Frontonasal Prominence

Caudal - Mandibular Processes

Lateral - Maxillary Processes

Deep- Oropharyngeal membrane

Term

 

What are the three components of the Pharyngeal apparatus?

Definition

 

- arches

- intervening endodermal pouches

- ectodermal clefts separated by a membrane

Term

 

What can be found in a pharyngeal arch?

Definition

 

aortic arch, cartilage, muscle and nerve

Term

 

What pharyngeal membrane becomes a membrane that consists of ectoderm, mesoderm, and endoderm but is almost transluscent?

Definition

 

1st pharyngeal membrane (becomes tympanic membrane)

Term

 

What skeletal, muscular, vascular, and neurological features are derived from the 1st pharyngeal arch?

Definition

 

Maxillary process (Maxilla, Zygomatic, Temporal bone)

Mandibular Process (Mandible, Incus and Malleus)

 

Muscles of Mastication

Ant Digastric, Mylohyoid, Tensor Tympani, Tensor Palatini

 

Trigeminal - CN V

Motor- V3

Sensory - V1, V2, V3

 

Maxillary arteries

Term

 

What skeletal, muscular, vascular, and neurological features are derived from the 2nd pharyngeal arch?

Definition

 

Hyoid

Ventral - Cranial 1/2 of hyoid

Dorsal- Stapes, Styloid process of temporal bone and Stylohyoid ligament

 

Muscles of Facial Expression (CN VII)

Stapedius, Stylohyoid, Post Digastric, Auricular

 

Facial (VII; motor)

 

Hyoid and Stapedial Arteries (regress in utero)

Term

 

 

What skeletal, muscular, vascular, and neurological features are derived from the 3rd pharyngeal arch?

Definition

 

Lower hyoid

 

Stylopharyngeus

 

Glossopharyngeal (CN IX; motor)

 

Internal and Common Carotid Arteries

Term

 

What skeletal, muscular, vascular, and neurological features are derived from the 4th pharyngeal arch?

Definition

 

Laryngeal cartilages

 

Cricothyroid, Levator Palatini, Pharyngeal Constrictors

 

Superior Laryngeal Branch of Vagas (CN X; motor)

 

R - Subclavian artery

L - Arch of the Aorta

Term

 

What skeletal, muscular, vascular, and neurological features are derived from the 6th pharyngeal arch?

Definition

 

Laryngeal cartilages

 

Intrinsic laryngeal muscles

 

Recurrent Laryngeal Branch of Vagas (CN X; motor)

 

Pulmonary Arteries (persistent ductus arteriosus?)

 

 

Term

 

What parts of the pharyngeal apparatus can grow to form a cervical sinus that has the potential to persist as a lateral painless cystic neck mass?

Definition

 

2nd and 4th arches over the 2nd, 3rd, and 4th clefts/grooves

Term

 

What structure does the 1st cleft of the pharyngeal apparatus persist as?

Definition

 

External Auditory Canal

Term

 

What structures are formed from the 1st endodermal pharyngeal pouch?

Definition

 

Middle ear cavity

Eustachian tube

Term

 

What structure are formed from the 2nd endodermal pharyngeal pouch?

Definition

 

Palatine Tonsil

Term

 

What structures are formed from the 3rd endodermal pharyngeal pouch?

Definition

 

Ventral - Thymus

Dorsal - Inferior parathyroid

Term

 

What structures are formed from the 4th/5th endodermal pharyngeal pouch?

Definition

 

Superior parathyroid

Ultimobranchial body (calcitonin producing "c-cells")

Term

 

Which pharyngeal arch makes up the anterior 2/3 of the tongue and what fuses to create the tongue as we know it in adulthood?

Definition

 

Arch I from the Lateral Lingual Swellings and Tubercum impar

Term

 

Which arches make up the posterior 1/3 of the tongue and what respective swellings fuse to form the tongue as we know it in adulthood?

Definition

 

2nd-4th arches

 

3rd - Inferior medial swelling (Copula)

4th- Hypobranchial Eminence (epiglotal swelling)

Term

 

What is the anterior 2/3 of the tongue innervation?

Definition

 

Sensory - CN V

Taste - CN VII

Motor - CN XII

Term

 

What is the posterior 1/3 of the tongue's innervation?

Definition

 

Sensory - CN IX, CN X

Taste - CN IX, CN X

Motor - CN XII

Term

 

What is the origin of the thyroid's descent in the neck?

Definition

 

Foramen cecum

Term

 

What structure separates the anterior 2/3's of the tongue from the posterior 1/3?

Definition

 

Terminal sulcus

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