The oral or pharyngeal apparatus serves the dual functions of respiration and feeding in many species in the animal kingdom. In humans, the mouth, nose and associated sinus, together with the pharynx which is connected to the larynx and trachea, form the upper respiratory tract.

What are the two pharyngeal arches?

The first, most anterior pharyngeal arch gives rise to the oral jaw. The second arch becomes the hyoid and jaw support. In fish, the other posterior arches contribute to the branchial skeleton, which support the gills; in tetrapods the anterior arches develop into components of the ear, tonsils, and thymus.

Are pharyngeal arches homologous?

1.1 Zebrafish Pharyngeal Arches as Models of the Mammalian Jaw and Middle Ear. Skeletal elements in the fish skull do not always have recognizable homologs in mammals (or vice versa), but there are some that clearly do.

How many pairs of pharyngeal arches are there?

five pairs
Pharyngeal arches, pouches, and clefts. There are five pairs of pharyngeal arches, numbered 1, 2, 3, 4, and 6 for comparative embryology reasons.

What are the 3 sections of the pharynx?

It contains three sections: the nasopharynx, oropharynx and laryngopharynx, which is also called the hypopharynx.

What are pharyngeal structures?

pharynx, (Greek: “throat”) cone-shaped passageway leading from the oral and nasal cavities in the head to the esophagus and larynx. The pharynx chamber serves both respiratory and digestive functions. Thick fibres of muscle and connective tissue attach the pharynx to the base of the skull and surrounding structures.

Is the pharyngeal apparatus a branchial apparatus?

• A branchial apparatus develops during mammalian embryonic development, but true gills are not formed. The mammalian branchial arches are transformed during development and we refer to the structure as the pharyngeal apparatus. 02. The pharyngeal arch system contributes greatly to head and neck development.

When do the pharyngeal arches appear?

The pharyngeal arch system contributes greatly to head and neck development. • The arches appear in the 4th week. They are best appreciated on the external surface of the embryo. • By the end of the 4th week, 4 pairs of arches are visible.

What is the pharyngeal membrane?

Pharyngeal membrane. A thin membrane, composed of ectoderm and endoderm, formed as the result of acontact between a pharyngeal groove and a corresponding pharyngeal pouch. Pharyngeal pouches. The endodermally lined depressions between the pharyngeal arches.Visceral arches. See: pharyngeal arches.

What is the difference between primitive pharynx and craniocaudal?

Primitive Pharynx – the cranial portion of the foregut. Craniocaudal-from the front of the embryo (cranio) to the back of the embryo (caudal) Diverticulum – an outpocketing. 01. Pharyngeal archesare homologous with the branchial archsystem of fish and larval amphibians.