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Spine Anatomy
Thoracic Anatomy
| Question | Answer |
|---|---|
| Where are the costal facets (demifacets) located on the T-Spine Vertebrae? | On the body, except for ribs 11 &12 |
| What do costal facets located on the TPs do? | articulate with rib tubercles |
| Clinically the T spine begins where? | T3, T1 & T2 are typically examined with the cervical spine |
| Do you know the Rule of 3's? | T1-3 SP in level with body, T4-6 SP in level with inferior disc, T7-9 projects to one vert level below its TP, T10-12 SP level with body again. |
| What motions do the T-spine facets allow for? | Rotation and SB |
| What dictates motion at the T Spine? | facet orientation, and ribs limit a lot of motion that would naturally be available |
| Ribs _-_ are considered typical. | 3-9 |
| what are the components of a typical rib? | Head (w/ crest and demifacets), neck, tubercle (facet included which actually articulates with TP), shaft, angle |
| Generally how many ribs does each Tspine vert articulate with? | 2 |
| T1 has ___(#) facets, what ribs are they responsible for? | 1 1/2 facets, one for rib 1, and a demifacet for superior aspect of rib 2 |
| Which vert only have one facet? | T10-12 |
| what is different about T11-12, other than that they only have one facet? | Heads of ribs articulate at the pedicles instead of the vertebral bodies, and no costransverse articualtion. |
| which ribs are true ribs, false ribs, and floating ribs? | 1-7 are true, 8-10 are false, and 11&12 are floating |
| What constitutes a true rib? | direct articualtion with the sternum via their own costal cartilage; false articulate with sternum via costal cartilage of the ribs above it; floating ribs don't articulate |
| So atypical ribs = which ribs (same #s as tspine vert)? | 1, 2, 10, 11, 12 |
| The 1st rib has how many facets? | 1 |
| Name the landmarks for the first rib. | A single facet, Scalene tubercle, groove for sublcavian vein, groove for subclavian artery |
| WHich ribs only have one facet? | 1, 10,11,12 |
| What articulates at the manubrium? | clavicle(via clavicular notch/sc jt), 1st rib (via facet), 2nd rib (via demifacet) |
| The sternum consists of ____, 4 fused segments, and the manubrium | Sternebrae |
| For our class, the SC jt is classified as what type of jt? | Saddle synovial jt |
| What shape is he clavicle A/P? S/I? | concave A/P, Convex S/I |
| What structures run right behind the SC jt? | L: common carotid and subclavian arteries; R: brachiocephalic trunk |
| Between the manubrium and body of the sternum, the manubriosternal jt contains a fibrocartilaginous disk which ossifies in ___% of adults. | 10% |
| ____is the jt between the xiphoid process and the sternum, and ossifies by? | xiphisternal jt; by 40-50 y/o |
| ____jts are the joints that artcilate between the ribs and usu the body of the tspine vert. | costovertebral jts |
| what type of jt are costovertebral jts? | Plane synovial |
| Name two ligaments of the costovertebral jt? | radiate and intra-articular lig |
| The radiate lig of the costovertebral jts has 3 parts; describe each section. | Superior: head to body above; middle: head to disc; inferior: head to body below |
| Intra-articular lig of the costovertebral jts connect ___ to _____. What does this accomplish? | head(crest) to vertebral disc; divides the jt cavity into inferior and superior compartments |
| What is the costotransverse jt? | connects the TP to the neck of the ribs |
| What stabilizes the costotransverse jts? | Three costotransverse ligs: Superior, medial and lateral |
| What are the costochondral jts? | rib and cartilage junction by the costal cartilages |
| What type of jts are the costochondral jts? | synchondrosis (non synovial) |
| What is the name of the jt that connects the costal cartilage to the sternum? | costosternal jts |
| Where do costosternal jts exist? | Ribs 1-7 |
| WHich costosternal jts are plane synovial? what does this mean? | 2-7; more mobile than 1st rib |
| Is there a lot of available motion in the costochondral jts? | No |
| What are interchondral jts? | joining between costal cartilages, seen in false ribs |