isthmus
The fleshy throat region of a fish which extends forward from the ventral part of the chest and narrows anteriorly, and externally separating the two gill chambers; that narrowed portion of the breast which lies between the gill chambers and separates them.
| Type | Organ |
| Parent Structure | external soft tissue zone |
Frequently Asked Questions
What is the isthmus?
The fleshy throat region of a fish which extends forward from the ventral part of the chest and narrows anteriorly, and externally separating the two gill chambers; that narrowed portion of the breast which lies between the gill chambers and separates them.
Related Structures
1st arch mandibular component
ventral mandibular arch
1st arch mandibular ectoderm
ectoderm of mandibular component
1st arch mandibular mesenchyme
mandibular component mesenchyme
1st arch mandibular mesenchyme from head mesenchyme
1st arch mandibular mesenchyme from neural crest
1st arch maxillary component
1st arch maxillary ectoderm
ectoderm of maxillary component
1st arch maxillary-mandibular cleft
1st arch maxillary-mandibular groove ectoderm
Medical Disclaimer
This content is for educational and informational purposes only. It is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.