musculoskeletal-anatomy

Musculoskeletal Anatomy Aides Memoires

A wee compilation of a just few helpful tips. Please feel free to add!

INNERVATION OF THE LOWER LIMB

MAP
↑ ↑ ↑
OF Sciatic

Medial compartment = Obturator nerve
Anterior compartment = Femoral nerve
Posterior compartment  = Sciatic nerve

INNERVATION OF THE GLUTEAL MUSCLES

(This one may be a little controversial…)

Big butts are Inferior
=> Gluteus maximus is innervated by the inferior gluteal nerve

CONTENTS OF THE TARSAL TUNNEL

Tom Dick And Not Harry

Tibialis Posterior
Flexor Digitorum Longus
Posterior Tibial Artery
Tibial Nerve
Flexor Hallicus Longus

DIFFERENTIATING THORACIC AND LUMBAR VERTEBRAE

Thoracics look like giraffes:

Lumbars look like moose(s?)

MUSCLES OF THE FOREARM

Superficial compartment = 4 muscles
Intermediate compatment = 1 muscle
Deep compartmnt = 3 muscles
=> 
4 - 1 = 3

Superficial compartment: ‘Pass, Fail, Pass, Fail’
Pronator Teres
Flexor Carpi Radialis
Palmaris Longus
Flexor Carpi ulnaris

CARPAL BONES

Mnemonics; there are SO many of these. My love of Scrubs led me always to use: 
Some Lovers Try Positions That They Can't Handle
Scaphoid Lunate Triquetrum Pisiform Trapzium Trapzoid Capitate Hammate

(Thank you Elliot Reed)

ATTATCHMENTS OF THE FLEXOR RETINACULUM

 

S T O P;
Scaphoid, Trapezium, 'Ook of Hamate, Pisiform

ANATOMICAL SNUFFBOX 

Tendon bounderies form a 'Brevis Sandwich;’
Extensor Pollicus Longus (medial)
Extensor Pollicis Brevis
Abductor Pollicis Longus (lateral)

Fibro-cat-ilage

It forms the inter-fur-tebral discs

i♡histo

Fibrocartilage is a specialized type of cartilage found in only a few specific regions of the body: intervertebral discs, menisci of joints (like the knee joint) and the symphysis pubis of the pelvis. It is made by cartilage cells called chondrocytes (the cats pupils) that reside in lacunae (the cats eyes).

Hyaline cartilage is the more common type of cartilage in the body. Its cells synthesize cartilage that contains very fine Type II collage fibers that are not good at resisting tensile forces (regular cartilage can tear easily under this force) but creates lots of space that is occupied by loads of water making - it ideal for resisting compressive forces (you can’t easily compress water right!) 

Fibrocartilage is different. It is impregnated with a a type of collagen more commonly found in strong tendons and ligaments - Type I collagen (the red/pink material that fills this image). This means that fibrocartilage is adapted to resist some compressive forces but also strong tensile forces. In other words it’s not quite cartilage and its not quite a ligament/tendon.

It’s an ideal tissue to sandwich between adjacent vertebra in the vertebral column (an intervertebral disc) where it forms the outer wall of the disc (annulus fibrosus). Here it is responsible for resisting the compressive and tensile forces generated when our vertebra try to move apart and together as we flex our spines during everyday movement.

Trollface Appendage

Know your memes, know your histology!

i♡histo

This is a transverse slice through the lower part of your leg. 

Trollface’s eyes are formed from the two bones in the lower leg - the tibia (larger) and fibula (smaller). You can see the bright pink spongy bone trabeculae that form the core of each bone and the purple connective tissue periosteum encircling each eye!

The rest of old Trollface is made up of skeletal muscle. Each muscle group is organized into fascicles and in turn groups of fascicles are organized into muscles that are subsequently grouped into compartments by connective tissue encircling collections of muscle fibers. The connective tissue responsible for this compartmentalization appears purple and has formed the outline of the nose, mouth and chin. A superficial fascia also surrounds the entire limb encircling all the muscles toward the periphery.

Finally, the very outer aspect of Trollface is his skin. It is also the skin that surrounds your leg. You can make out some tiny purple dots in the dermis which are the hairs and hair follicles that have been sectioned.

Trollface himself is a rage comic character created by Carlos Ramirez and posted to the internets. He represents the smugness of an internet troll. His original character was reposted all over the internet and is now legendary among internet memes.