Dog · Bone · Thorax
Rib 1
Costa I
A head and tubercle articulating with its vertebra, an angle where it turns, and a shaft ending in a costal cartilage.
- System
- Bone
- Region
- Thorax
- Sides
- Paired: left and right
- Named parts
- 6
Where it runs from and to
A muscle is told apart from its neighbours by what it takes hold of at each end, which is also what decides what it does when it shortens.
- Action
- A head and tubercle articulating with its vertebra, an angle where it turns, and a shaft ending in a costal cartilage.
Written for Vetomica in its own words from the standard reference anatomy of the dog; the books it was checked against are listed below.
Named parts
What to look for on the bone, and what each part is called in the Nomina Anatomica Veterinaria.
- Head of the ribCaput costae
- The end that meets the bodies of two neighbouring vertebrae.Miller 2020, p. 294
- Neck of the ribCollum costae
- The narrowing beyond the head.Miller 2020, p. 294
- Tubercle of the ribTuberculum costae
- The knob beyond the neck that meets the transverse process of its own vertebra.Miller 2020, p. 294
- Body of the ribCorpus costae
- The shaft; the first is the shortest and straightest of the thirteen.Miller 2020, p. 294
- Angle of the ribAngulus costae
- Where the shaft turns to run down the chest wall.Miller 2020, p. 294
- Costal grooveSulcus costae
- The channel inside the caudal border that the intercostal vessels and nerve lie in.Miller 2020, p. 294
What it meets
Articulates with T1 (and C7) and the manubrium; thoracic inlet.
Bones it articulates with
- Thoracic vertebrae
- Cervical vertebra 7
- Manubrium
Joints it forms
- Joint of head of rib
Muscles and ligaments that take hold of it
- Sternocostal joints
Measured on the specimen
What the rib 1 is in contact with in the model itself, with the share of the other structure’s surface it covers. A contact is not always a joint: bones that simply lie against one another are in this list too.
- Thoracic vertebra II2%
- Costal cartilage 112%
- Humerus2%
Measured on the left side.
Terminology
- English
- Rib 1
- Latin (NAV)
- Costa I
- Status
- A valid term in the Nomina Anatomica Veterinaria
References
Where to read this structure in full, and where the named parts above were read.
- Miller 2020Miller 2020, ch. 4 The Skeleton, Ribs, PDF p. 292
- König & Liebich 2020skeleton of the thorax, p. 125
- Dyce 2017ch. 13 Thorax of the Dog and Cat, p. 403
- NAV 2017Osteologia