What does ramus mean?
A ramus is a branchlike part that projects from the main body of an anatomical structure. Its best-known use is for the ramus of the mandible, one of the two upright portions of the lower jawbone. A branch of the pubis and the projecting processes of a vertebra can also be called rami. Although the word can convey the general idea of a branch or bough, it is mainly used in technical contexts such as anatomy, zoology, and comparative morphology. In ordinary conversation, branch would normally be preferred because ramus is a formal Latin-derived term. The plural rami is standard in anatomical writing and scholarly descriptions. Understanding ramus is useful when reading medical discussions, descriptions of animal anatomy, and structural classifications based on branching forms.
nounA branchlike projection or process, especially one of the two parts of the lower jawbone. The term is also used more generally for a branch or arm of an anatomical structure.
- A branchlike bony projection, especially either of the two posterior parts of the lower jawbone.
- A branch, arm, or other process extending from an anatomical structure.
"The fracture extended from the body of the mandible into its ascending ramus."
"The surgeon fractured the ramus of the pubis during the operation."
"In anatomy, a ramus is the part of a structure that projects from its main body."
The plural rami is standard, especially in anatomical terminology.
"Fractures involving the rami of the mandible require careful assessment."
The mandible's ramus is the upright branch of the lower jaw, giving the bone its familiar forked shape.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does ramus come from?
The English word comes from Latin rāmus, meaning “branch” or “bough.” The same Latin root underlies ramify and ramification, while ramous and ramulose are uncommon English adjectives also derived from it. Latin anatomical usage established rāmus for a projecting part such as the branch of a bone.
Related word forms
How ramus is actually used
This is chiefly a technical term in anatomy, biology, and comparative morphology. In clinical usage, it most often refers to a branch of the mandible and is normally pronounced with the first syllable stressed.
Easily confused with ramus
A ramus is a branchlike projection, whereas a radius is a spoke-like bone or a distance from the centre of a circle.
A ramus is an anatomical or branching projection; a ramp is an inclined surface or sloping structure.