Anatomy Topic 2 Case 1 Flashcards
- Surface Anatomy of the Thorax - Muscles of the Chest Wall - Thorax, its associated bones, joints and ligaments - Neurovascular Supply of the Thorax - Diaphragm
At which vertebral level is the jugular notch located?
- TII
The costal cartilage of which rib articulates with the sternum at the level of the sternal angle?
- Rib 2
What occurs at the vertebral level TIV/V?
- Costal cartilage of rib 2 articulates with sternum
- Superior mediastinum is separated from the inferior mediastinum
- Arch of the aorta begins
- Thoracic aorta begins
- Trachea bifurcates
What is the origin of the sternocleidomastoid?
- Sternal head, upper part of anterior surface of manubrium of sternum
- Clavicular head, superior surface of medial one third of clavicle
What is the insertion of the sternocleidomastoid?
- Sternal head, lateral one-half of superior nuchal line
- Clavicular head, lateral surface of mastoid process
What is the innervation of the sternocleidomastoid?
- Accessory Nerve [CNXI)
- Anterior Rami of C2, C3 and C4
What is the function of the sternocleidomastoid?
- Tilt head towards shoulder on same side
What is the origin of the anterior scalene?
- Anterior tubercles of transverse processes of C3 to C6
What is the insertion of the anterior scalene?
- Scalene tubercle and upper surface of rib 1
What is the innervation of the anterior scalene?
- Anterior rami of C4 to C7
What is the function of the anterior scalene?
- Elevation of rib 1
What is the origin of the middle scalene?
- Transverse processes of vertebrae C3 to C7
What is the origin of middle scalene?
- Upper surface of rib 1
What is the innervation of the middle scalene?
- Anterior rami of C3 to C7
What is the function of the middle scalene muscle?
- Elevation of rib 1
What is the origin of the posterior scalene?
- Posterior tubercles of transverse processes of C4 to C6
What is the insertion of the posterior scalene?
- Upper surface of rib 2
What is the innervation of the posterior scalene?
- Anterior rami of C5 to C7
What is the function of the posterior scalene?
- Elevation of rib 2
Identify three functions of the thorax
- Breathing
- Protection
- Conduit
What are the anterior, lateral and posterior margins of the superior thoracic aperture?
- Anterior: Manubrium
- Lateral: Rib 1
- Posterior: Vertebra T1
What are the anterior, anterolateral, posterolateral and lateral margins of the inferior thoracic aperture?
- Anterior: Xiphoid Process
- Anterolateral: Ribs 7-10
- Posterolateral: Ribs 10-12
- Posterior: Vertebra T12
What are the anterior, posterior and lateral margins of the thoracic wall?
- Anterior: Sternum
- Lateral: Ribs
- Posterior: Thoracic Vertebra
Identify the three articulations of each rib to the vertebral column
- Head: Facet to its own vertebral body and body above
- Angle: Transverse process of its own vertebra
What is a true rib?
Identify the true ribs
- Articulate with sternum
- Ribs 1 - 7
What is a false rib?
Identify the false ribs
- Articulate with costal cartilage above
- Ribs 8 - 10
What is a floating rib?
Identify the floating ribs
- No anterior connection
- Ribs 10 - 12
Describe the head of a rib
- Two articular facets
- Smaller superior facet for articulation with above rib
- Larger inferior facet for articulation with its own rib
Describe the neck of a rib
- Short flat region
- Separating the head from the tubercle
Describe the tubercle of a rib
- Between the neck and shaft
- Articulates with a facet on the transverse process of its own vertebrae
Why is Rib 1 considered an atypical rib?
- Flat in transverse plane
- Single facet
- Scalene tubercle (anterior by scalene vein, posterior scalene artery)
Why is Rib X considered an atypical rib?
- Single
Why are ribs XI and XII considered atypical ribs?
- Single facet
- No tubercles or necks
- Short and little curve
- Pointed anteriorly
Identify four bony landmarks of the manubrium of the sternum?
- Jugular notch
- Fossa for articulation with clavicle
- Facet for articulation with first costal cartilage
- Demi-facet for articulation with superior aspect of second costal cartilage
Identify four bony landmarks of the body of the sternum
- Transverse ridges
- Demi-facet for articulation with inferior aspect of second costal cartilage
- Four facets for articulation with ribs 3 - 6
- Demi-facet for articulation with the superior aspect of seventh costal cartilage
At which vertebral level is the xiphoid process located?
- T10
How does the xiphoid process differ in children and adults?
- Cartilaginous structure at birth
- Which becomes ossified in the adult