How to differentiate between left and right bones

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• A&P: Lab #4 - Left & Right Bones

by Nikki Rose Ty, Oct. 2009

Subjects: anatomy physiology skeletal system

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  UGH my brain is melting. I've been studying for my anatomy exam like crazy and I still can't wrap my brain around the left bone vs. the right bone. Does anyone have an easy neat tricks to remember the difference?

  Specifically: Clavicles, scapulae, tibia, fibula, ulna, radius

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  jonjon62288

  44 Posts

  Sep 27, 2009

  Rules for Left and Right Bones

  1. Humerus - hold the bone so that the capitulum and trochlea face YOU (anterior)
     • If the head faces left - it is a left humerus
  2. Ulna - face the trochlear notch away from you (U-shaped process) and look at the olecranon
     • Ask yourself - on what side is the radial notch?
     • If it is on the right - it is a right ulna
  3. Radius - orient the bone with the round head UP and the distal end DOWN
     • Look at "bumps" at the distal end
     • Look for the styloid process at the distal end
     • If it is on the right side - it is a right radius
  4. Scapula - hold the bone with the spine facing YOU and the apex facing DOWN
     • If the acromion faces left - it is a left scapula
     • NOTE: the corocoid process is spelled with a "c" and so is "scapula"
  5. Femur - the head must face IN and the lesser trochanter must be on the BACK side of the bone
     • So hold the bone so that the head is on top and the trochanters are on the BACK surface of the bone
     • If the head faces left - it is a left femur
  6. Tibia - hold the bone so that the intercondylar eminence is towards the top and you are looking at the tibial tuberosity
     • If the medial malleolus on the distal end is on the left side - it is a left tibia
  7. Clavicle - a. point the flat sternal end toward the midline
     • b. the clavicle bulges OUT then IN
     • c. the conoid tubercle must point DOWN

  Telling the Types of Vertebrae Apart

  • Cervical - three holes, forked spinous process
  • Thoracic - one hole, long, thin spinous process
  • Lumbar - one hole, processes are thick and large
  • Atlas - looks very different, almost like a circle
  • Axis - look for the "dens" near the body

  Corocoid - "c" in scapula
  Coronoid - "n" in ulna (or mandible)
  Conoid - is the clavicle

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  How can you tell the difference between the left and right femur?

  Also, if you place the condyles of a human femur flat on a table surface, the shaft of the bone will have an angle, called the valgus angle. It angles outward toward the hip from the center of mass of the body. So a right femur angles toward the right, a left femur angles toward the left.

  How can you tell the difference between left and right humerus?

  The side on which the capitulum faces determines the bone side. If the capitulum is facing the right side or is present on the right side of the bone then it is the right humerus bone. If the capitulum is present on the left side of the bone then it is the left humerus bone.