Musculoskeletal Flashcards
Which two ways do bones arise embryonically?
Intramembrenous ossification and endochondral ossification
What type of cartilage makes up the skull sutures?
Fibrous cartilage
Stages of bone healing (secondary):
-Hematoma
-Inflammation
- Soft Callous
-Hard callous - woven bone - mineralisation by calcium hydroxyappetate
-Remodelling - lamillar bone
What enzyme causes bone mineralisation?
Calcium hydroxyapatite
Difference between osteoperosis and osteomalacia?
Osteoporosis = bone degradation, weakness.
Osteomalacia = mineral deficiency, bendy bones.
Which drug class is commonly used to treat osteoporosis?
Biphosphonates
What cell type manages the cartilage in joints?
Chondrocytes
What are the 4 key signs of osteoarthritis on an XRay? Why are each caused?
LOSS
L- loss of joint space - cartilage erodes and fluids loss as proteoglycan in cartilage kept fluids in.
O - Osteophytes - TGF -B
S - sclerosis - TGF-B
S - subchondral cysts - synovial fluid can leak into bones via fissures once articular cartilage is gone
What molecule is needed for sclerosis in osteoarthritis?
TGF-B made in inflammation of joint can leak into fissures and start mucking with bone (osteophytes) and causing scarring too.
What part of the body does gout target?
Uric acid joins with sodium to form monosodium urate in the cold areas of the body.
Typically big toe.
How does meat cause gout?
Purines –> Xanthine to be done by xanthine oxidase –> uric acid –> monosodium urate –> WBC can’t eat spiky crystals –> ouch
List risk factors for gout:
Meat eater, shellfish, alcohol, thiazide diuretics, T2D, CKD, chemo.
What is the preventative treatment for gout?
Allopurinol - xanthine oxidase inhibitor.
What structure allows the leg to ‘unlock’
popleteus (princess diary pop)
What is the jutty part of the elbow called and what bone does it correspond to?
The olecranon process of the ulnar
Where do most arm flexors attach?
Medial epichondyle of the humerus
Which joint is important in the flexion and extension of the elbow?
The ulnarhumeral joint only
Which joint(S) control supranation and pronation?
the radial joints - makes sense cos only radius touches hand.
Radiohumeral and radioulnar
Which muscle controls supranation?
Biceps brachii - also the arm must be in supranation to flex the biceps
What does Tennis elbow effect?
The lateral epichondyle (think T’s together - lateral And tennis)
What does Golfer’s elbow effect?
Medial epichondyle
What is the one place the shoulder complex articulates with the rest of the body?
Sternoclavicular joint
What are the three shoulder joints?
Sternoclavicular, acromioclavicular, glenohumeral
What does the scapular spine end in?
The acromion
Describe the tubercles of the humerus
greater tubercle is lateral is an attachment site for literally everything, lesser tubercle is medial
Where do the heads of the bicep tendons attach?
Short- coracoid bone
Long - passes inside glenohumeral capsule to attach to Glenoid
What ligament stops the humerus from pushing superiorly?!
The coracoacromial ligament forms a roof over the glenohumeral joint
What is a frozen shoulder?
Inflammation of the subacromial bursa
Describe wrist adduction and abduction
Wrist adduction - towards midline = ulnar deviation
Wrist abduction = away from the midline = radial deviation.
Mnemonic for wrist bones?
So long to pinky, here comes the thumb.
Which wrist bone is most prone to degeneration?
Trapezium
Which wrist bone is most likely to fracture?
Scaphoid
Which wrist bone can you feel through the snuffbox?
Scaphoid
Which of the arm nerves is the most prone to injury?
Ulna
Which carpals form the walls of the carpal tunnel?
TOH
Trapezium and Hamate
What is the most degenerative joint in the body?
Trapeziometacarpal joint
Which movement can the metacarophalangeal joints do that the other phalangeal joints can’t?
Circumduction
Which two muscles shoulder muscles assist breathing?
Pec major and serratous anterior
Flexion - Which muscles control the distal interphalangeal joints and which muscles control the proximal ones?
Proximal - flexor digitorium superficialis
Distal - flexor digitorium produndus - must pierce through superficialis to get there
In detail, describe the brachial plexus?
C5-9, split into trunks and devisions and cords.
Trunks are superior, which becomes anterior devision and then lateral and then MSC nerve.
Middle which becomes posterior and then posterior and then radial and axilliary nerves.
Inferior which becomes anterior which becomes medial which becomes ulna.
Both anterior divisions unite to form the median nerve.
How is NAD recycled in fermentation?
By using lactate
Falling backward onto your hand is likely to break which bone?
Scaphoid
Describe the movement of the trapezius muscles.
Have 3 segements:
Descending - neck - elevates scapula
Transverse - adducts/retarcts scapula
Ascending - lower back - depress scapula
Deficiency in which muscle causes scapular winging? Which nerve could do the same?
Serratus anterior muscle
Long thoracic nerve
Mnemonic for pectoral girdle muscles? What movements are associated with the pectoral girdle?
PSST Look Right!
PSSTLR - anterior ones first, then posterior.
P - pec minor
S - Subclavius
S - serratous anterior
T - trapezius
L - levator scapulae
R - rhomboids
Mnemonic for the shoulder muscles? Which of these are in the rotator cuff?
Delt SPLITS (SITS muscles are in rotator cuff)
Delts
S - Supraspinatous
P - pec major
L - latissimus dorsi
I - Infraspinatous
T - teres minor
S - subscapularis
What muscles do shoulder abduction?
Delts and the first 15 degrees is supraspinatus
Mnemonic for arm compartment movements?
PEE - posterior extends elbow
What are the 3 muscles of the anterior arm?
Biceps brachii, brachialis, corocobrachialias
Where do all 3 heads of the triceps attach distally?
Olecronon
Which forearm compartments control suprination and pronation?
Pronation is anterior with flexors
Suprination = posterior
List the components of the carpal tunnel.
9 x tendons - 4xFDP and 4xFDS and 1x Flexor pollicis longus but it travels in its own sheath.
AND the median nerve.
Which forearm muscle does not match the theme of anterior = flexion and posterior = extension?
Brachioradialas - it is posterior but actually does flexion (traitor)
Describe the arteries of the hand?
The radial artery is mostly deep, the ulna artery is mostly superficial
Which nerve of the arm has no muscle control past the wirst?
Radial nerve - it is just dermatomes at that point
What are the 3 muscles that form the axilla?
Serratous, pec major, subscapularis
What is the function of the musculocutaneous nerve?
We know from the brachial plexus that it is in the anterior division, so it will serve the anterior compartment of the arm and then will become a supply for just the cutaneous (in the name) past the elbow.
Which nerve supplies the deltoid?
Axillary
Injury of the radial nerve causes what condition?
‘saturday night palsy’
WRIST DROP
Which nerve succeeds the MSC nerve as muscle innervator past the elbow?
Ulna
Damage to what nerve causes claw hand?
Ulna
Describe the dermatomes of the hand?
Start with palm.
Small thumb section done by radial, pinky and half of ring finger done by ulna, rest is median.
Dorsal - ulna has same pattern. median forms tops of first 3 fingers, half of 4th. Rest is radial.