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44720

Morphology of Auditory Canal of Echidna (Tachyglossus aculeatus)

Article

Last updated: 04 Jan 2025

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Abstract

The echidna is a monotreme a mammal that lay eggs and produces milk to nourish its young after hat- ching. Three short-beaked echidnas were used to study the morphology of their auditory canal. Three echidnas were dissected, two of them were x-rayed and samples for histological examination were taken from them before dissection. The echidna possesses neither an apparent ear pinna nor a tympanic bulla. The auditory canal begins at the bottom of the auditory groove, which is vertically situated and hid- den between the spikes of the head. It is hyaline cartilage in nature, and extends from the bottom of the audi- tory groove, running cranially; then after turning caudomedially. It ends at the slit-like external auditory opening of the skull. The epidermal layer of skin that lines the auditory canal is keratinized stratified squamous epithelium. The deep dermal layer is formed of dense connective tissue of collagen and elastic fibers with hair follicles and a few associated sebaceous and ceruminous glands. The results were discussed in the light of the ear evolution from reptiles to the early mammals (monotremes) and supported by 9 images.

DOI

10.21608/jva.2014.44720

Keywords

short-beaked echidna, Tachyglossus aculeatus, monotremes, auditory canal, anatomy, histology

Authors

First Name

Ashraf

Last Name

Saber

MiddleName

Sobhy Mohamad

Affiliation

Department of Anatomy & Embryology. Fac. Vet. Med., University of Sadat City, EGYPT

Email

saberashraf_2@yahoo.com

City

Cairo

Orcid

0000-0001-6707-5160

First Name

A.

Last Name

Hassanin

MiddleName

-

Affiliation

Department of Cytology and Histology, Faculty of Veterinary Medicine, University of Sadat City, Sadat City, Egypt.

Email

-

City

Sadat City

Orcid

-

Volume

7

Article Issue

1

Related Issue

6939

Issue Date

2014-04-01

Receive Date

2013-12-11

Publish Date

2014-04-01

Page Start

113

Page End

126

Print ISSN

1687-9988

Online ISSN

2357-0504

Article File

JVA_Volume 7_Issue 1_Pages 113-126.pdf

PDF . 1.1MB

Link

https://jva.journals.ekb.eg/article_44720.html

Detail API

https://jva.journals.ekb.eg/service?article_code=44720

Order

9

Type

Original Article

Type Code

782

Publication Type

Journal

Publication Title

Journal of Veterinary Anatomy

Publication Link

https://jva.journals.ekb.eg/

MainTitle

Morphology of Auditory Canal of Echidna (Tachyglossus aculeatus)

Details

Type

Article

Created At

22 Jan 2023