Zebrafish Anatomical Dictionary
Structure description: Hemal arches (of preural centra)
by Paula Mabee and Nathan C. Bird
Name: Hemal arches (preural)
hypurals (larval, 5.8mm)
Specialized preural hemal arches and spines.
Hypurals: The hypurals are expanded and laterally flattened hemal arches and spines. They support the lepidotrichia of the caudal fin. The hypurals form ventral to the posterior tip of the dorsally-flexed notochord. In zebrafish condensations of the hypurals begin forming at approximately 6 dpf (4.1 mm NL, notochord length).
Parhypural: Hemal arch and spine of preural centrum 1. The parhypural is defined as the most posterior hemal arch with an open canal through which the ventral aorta passes. The parhypurapophyses (also "hypurapophyses") are the paired bony lateral extensions off the hemal arch of the parhypural. They serve as origin for the anterolateral bundle of the hypochordal longitudinal muscle (Lundberg and Baskin 1969).
Unlike the other (more anterior) hemal arches and most neural arches, the hemal arches of the preural centra form autogenously, with the remaining undergoing intramembranous ossification. The cartilaginous precursors of the hemal arches of preural centra 1 and 2 develop as blocks on the ventral surface of the preural centra. These arches will eventually fuse with the hemal spines.
- Human: none
- Mouse: none
- Chicken: none
- Frog: none
- Fly: none
- First appears at: ha (of pu1): early larval, 4.9mm; ha (of pu2): early larval, 5.1mm
- Disappears (or changes name)by: ossify later, present in adult
Parents (forms from): sclerotome
- Presumptive (thought to give rise to): present in adult
- Anlage (known to give rise to): present in adult
Group (member of):
- Anatomical (group member): caudal fin skeleton
- Functional (group member): unspecified
- Other: Alcian Blue (cartilage) and Alizarin Red (bone), as per the method of Dinkerkus and Uhler (1977) with modifications by Potthoff (1985).
- Primary: Mabee, P.M. and Bird, N.B. (2001) A preliminary description of the anatomy and development of the zebrafish axial skeleton. ZFIN Direct Data Submission.
Ferreri et al., J. Fish Biol. 56:1115-1128 (2000)
Dingerkus and Uhler, Stain Technology 52: 229-232 (1977)
Potthoff, In Ontogeny and Systematics of Fishes, vol. 1 (ed. H. G. Moser) Spec. Pub. Am. Soc. Icthyol. Herp, (1984).