The thorax: sternum and ribs Flashcards
Composed of the manubrium, corpus sterni, and xiphoid process
The sternum
On manubrium, points of articulation with left and right clavicles. Collarbones articulate medially
Clavicular notches
On manubrium, central notch on superior edge of manubrium. Where the jugular artery passes through
Jugular notch
On manubrium, points of articulation for costal cartilage
Costal notches
Where the manubrium and sternum meet. Angle formed between fused manubrium and corpus sterni
Sternal angle
Manubrium superior and xiphoid process inferior, anterior surface rough and convex, posterior surface smooth and concave
Orienting sternum
Sternum, 12 ribs per side, 24 total
The thorax
Ribs 1-7, connect via their own costal cartilage to the sternum, don’t share with other ribs
True ribs
Ribs 8-10, share a common cartilage attachment
False ribs
Ribs 11-12, do not articulate with the sternum, articulate posteriorly with T1-T12
Floating ribs
Houses essential organs, useful for determining cause and manner of death, can be used to age adults
Ribcage functions
Part of the rib, swollen proximal part of rib, contains two demifacets for contact with thoracic vertebrae
Head
Short segment between head and tubercle on rib, constricted as you move laterally from head
Neck
Point of articulation on the rib with the transverse process of thoracic vertebrae, raised rough portion on rib, point of attachment
Tubercle
Body of rib, long part of the bone
Shaft
Sharp curve in bone lateral to tubercle, point on the rib where it changes direction
Angle
Anterior end that attaches to costal cartilage, first ten ribs connect with cartilage, flat and distinct compared to head
Sternal end
Special rib. Broad, flat, tightly curved. Superior surface is rough and inferior is smooth. Wide and short
First rib
Special rib. Intermediate between first and third, large tuberosity on midshaft, tight angle, elongated neck
Second rib
Special rib. Shortest, single facet and no tubercle. Lacks angle. Witch’s fingernail, floating rib
Twelfth rib
Made of the clavicle and scapula. Great mobility, but unstable
Shoulder girdle
S shaped bone, medial end articulates with sternum. Distal articulates with scapula. Last bone to fully fuse, superior view smooth, inferior has a groove
Clavicle
Part of clavicle, medial end, inferior surface. Point of attachment for costoclavicular ligament
Costal impression
Part of clavicle, posterior inferior midshaft, protects neck vessels, groove on inferior view of clavicle
Subclavian sulcus
Part of clavicle, lateral and posterior. Attaches ligament from scapula to clavicle, secures articulation with scapula
Conoid tubercle
Medial end round, lateral end flat. Bone bows anteriorly on the medial end and posteriorly on the lateral end. Inferior surface is rougher, medially bows convex, laterally concave
Siding the clavicle
Shoulder blades, anterior is smooth and posterior has a spine
Scapula
Top edge of scapula, upper surface besides the bump
Superior border
Edge of bone faces laterally scapula
Lateral border
Medial edge of bone in scapula
Medial border
Point where the lateral and medial borders of the scapula unite
Inferior angle
Point where the medial and superior borders of scapula unite
Superior angle
Transmits the suprascapular nerve on scapula
Superior notch
Raised portion of scapula, posterior surface has a long ridge of bone that moves medial to lateral
Scapular spine
Deltoid muscle attachment, anteromedial surface articulates with clavicle. Juts out, attaches to muscle. Comes around anteriorly to articulate with clavicle on the scapula
Acromion process
Smooth empty space above scapula spine
Supraspinous fossa
Flat smooth area below the scapula spine posteriorly
Infraspinous fossa
Shallow oval concavity humeral head articulates. Looking into scapula medially on the lateral surface. Slightly concave, articulates with humerus
Glenoid fossa
Lateral view of scapula, anchor for various shoulder muscles
Coracoid process
Lateral view of scapula, anchor for triceps muscle, below glenoid fossa
Infraglenoid tubercle
Glenoid fossa is lateral, spine posterior, inferior angle inferior
Siding scapula