Skeletal System Thorax Anatomy Bony Thorax Chest Part
Skeletal System Thorax Anatomy
Bony Thorax • Chest – Part of vertebrate, ribs, sternum – Protects organs – Provides support
Sternum • Flat bone • 3 important markings (jugular notch, sternal angle, xiphisternal joint)
Ribs • 12 pairs • Attach directly to sternum true ribs (7 pairs) • Attach indirectly to sternum false ribs (5 pairs) • No anterior attachment to sternum Floating ribs
Appendicular Skeleton • Limbs and their girdles • Carry out movements
Pectoral (Shoulder) Girdle • Clavicle • Scapula
Pectoral (Shoulder) Girdle • Clavicle – Collarbone – Anchors muscles – Not very strong • Can damage subclavian artery • Sensitive to muscle pull
Pectoral (Shoulder) Girdle • Scapula – Shoulder blade
Upper Limb (Arm) – Tubercle (where muscles attach) • Humerus – Longest, largest, bone of upper limb – Supracondylar ridges- ulnar nerve runs behind it (Funny bone)
Forearm • Contain ulna and radius • Connected by a membrane • Form an “X”
Ulna • Longer of the forearm bones • Forms the elbow joint
Radius • Anchors the biceps • Major forearm bone with wrist joint – When radius moves…the hand moves
Hand • Includes the carpus (wrist) and phalanges (fingers)
Carpus • 8 bones • Very flexible • Scaphoid, lunate, triquetral, pisform, trapezium, trapezoid, capitate, hamate – Sally left the party to take Cathy home
Carpal Tunnel Syndrome • Carpus is concave and a ligament is above the cavity – Forms a tunnel • Nerves and tendons crowd this tunnel • Overuse cause them to swell compresses nerve/causes numbness
Metacarpus (Palm) • Small, long bones are not named • Form the knuckles when you make a fist • Metacarpal 1 thumb
Phalanges • • Fingers, digits Thumb pollex Third finger is longest in most people Except for thumb each finger has 3 phalanges
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