What is a rachis or shaft?
Rachis or Shaft: (Pronounced RAY-kiss) The long, slender central part of the feather that holds the vanes. It’s like the mast that holds the sails. Vane: The plumed part of the feather that grows from the central shaft. The vanes are like the canvas sails on a mast. Notice that the two vanes of this feather are about equally wide.
What is a rachis on a feather?
Rachis or Shaft: (Pronounced RAY-kiss) The long, slender central part of the feather that holds the vanes. It's like the mast that holds the sails. Barb: The barbs grow from the rachis. Each barb is a feather within a feather with a little shaft and little barbs of its own called barbules.
What is the difference between rachis and Vane?
Rachis or Shaft: (Pronounced RAY-kiss) The long, slender central part of the feather that holds the vanes. It’s like the mast that holds the sails. Vane: The plumed part of the feather that grows from the central shaft.
What is the meaning of rachis?
Definition of rachis. 1 : an axial structure: such as. a(1) : the elongated axis of an inflorescence. (2) : an extension of the petiole of a compound leaf that bears the leaflets.
What is the rachis of a feather made of?
barbuleYou might think that the central feature – the rachis – came first, followed by the structures that branch off it. But the fact that the rachis itself is made of barbule-like fibres suggests that the barbules came first.
What are the 3 parts that make up a feather?
Barb: an individual strand of feather material (keratin), extending laterally from the rachis. Barbule: a lateral branch of a feather barb. Calamus: the hollow inner portion of the feather shaft that lacks barbs and attaches to the skin. Sometimes called the quill.
Is the rachis hollow?
Feathers have a basic form of a hollow, central shaft called a rachis and a number of smaller side branches.
What is rachis in bird?
In bird: Feathers. …a tapered central shaft, the rachis, with paired branches (barbs) on each side. An unbranched basal section of the rachis is called the calamus, part of which lies beneath the skin. The barbs, in turn, have branches, the barbules.
Are feathers like fingernails?
Feathers are made of keratin, just like our hair and fingernails, but they seem a lot more complex because we don't live with them every day.
What's the end of a feather called?
What is this? The pointy end of the feather is called the inferior umbilicus. This is the hollow opening where when the feather was growing it received nourishment. The portion of the shaft between the two webs of the vane is called the rachis.
What is meant rachis?
Definition of rachis 1 : an axial structure: such as. a(1) : the elongated axis of an inflorescence. (2) : an extension of the petiole of a compound leaf that bears the leaflets.
What is rachis in plants?
In plants, a rachis is the main axis of a compound structure. It can be the main stem of a compound leaf, such as in Acacia or ferns, or the main, flower-bearing portion of an inflorescence above a supporting peduncle. Where it subdivides into further branches, these are known as rachillae (singular rachilla).
What's inside a feather?
The typical feather consists of a central shaft (rachis), with serial paired branches (barbs) forming a flattened, usually curved surface—the vane. The barbs possess further branches —the barbules—and the barbules of adjacent barbs are attached to one another by hooks, stiffening the vane.
What's the stem of a feather called?
Down feathers are smaller and fluffier. The stiff, sharp "stem" by which the feather in the picture is held is the quill, or calamus. The stiff "midrib" running up the feather's center is variously called the rachis, shaft or stem. The main, flat, often pigmented part of the feather is known as the vane.
What are the webs of a feather called?
The most likely answer for the clue is VANES. We found more than 1 answers for Webs Of Feathers..
What is middle of feather called?
The spine down the middle, called the shaft, is hollow. The vanes are on the two halves of the feather. They are made of thousands of branches called barbs. Because there are many spaces between these barbs, a feather has as much air as matter.
What are the parts of a feather?
The parts of a feather you can see with the unaided eye are the rachis, vane, afterfeather, barbs, downy barbs and the hollow shaft. There are also tiny parts called barbules and hooklets that help hold the barbs together and give the feather its shape.
What makes up a feather?
Feathers are made of lightweight material called keratin just like our fingernails. Muscles attached to the base of each one allow the bird to move it around. Feathers have to handle a lot of wear and tear, so each year birds grow a new set to replace the old ones.
What are the 4 types of feathers?
The bird feather diagram below displays the different parts of the bird feather. It is labeled with the calamus (quill), rachis (shaft), barbs, and vane.
What are the parts of a quill?
The quill is the smooth, hollow, non-colored part of the feather, which inserts into a follicle in the skin. The vane is located on each side of the rachis and is composed of barbs. The rachis is the central part of the feather from which the barbs extend.
Phenology, Development, and Growth of the Wheat (Triticum Aestivum L.) Shoot Apex: A Review
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The inflorescence is a complex of highly modified, reduced shoots. The rachis is the inflorescence shoot system ( Fig. 3.22 ). It is composed of a basal portion (the peduncle), two main branches—the inner and outer (or lateral) arms, and various subbranches, terminating in pedicels. Pedicels give rise to individual flowers.
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Learn about this topic in these articles
In feather …of a central shaft (rachis), with serial paired branches (barbs) forming a flattened, usually curved surface—the vane. The barbs possess further branches —the barbules—and the barbules of adjacent barbs are attached to one another by hooks, stiffening the vane. In many birds, some or all of the feathers lack… Read More
structure
In feather …of a central shaft (rachis), with serial paired branches (barbs) forming a flattened, usually curved surface—the vane. The barbs possess further branches —the barbules—and the barbules of adjacent barbs are attached to one another by hooks, stiffening the vane. In many birds, some or all of the feathers lack… Read More
