What areas of the nose are resected when “cephalic trim” is performed?

Cephalic is a term that means closer to the head, while caudal means closer to the tail. A cephalic trim of nasal tip cartilage, is removal of the top portion of the alar tip cartilages typically to achieve narrowing and rotation of the nasal tip. Thank you. Dr Joseph 

Superior or the upper parts of the lower lateral cartilages are trimmed in this technique. This is typically performed in wide / bulbous noses / boxy tips and also the improve the definition and rotation of the nasal tip. 
These are carefully performed procedures. Too little resection may not give much improvement. Too much resection however can weaken the tip and can also cause collapse. Symmetry at the end of it has to be paramount. 
These are challenging techniques so do discuss them with an experienced and board certified facial plastic surgeon.
Best Wishes

A cephalic trim is a technique used to refine the tip of the nose.  Cephalic refers to the upper portion of the lower lateral cartilages, and by resecting that upper portion, the tip of the nose can be lifted and narrowed.  One must by careful to leave some of the lower lateral cartilages intact, because too much resection can lead to airway problems and a pinched tip.

In a cephalic trim, the superior aspects of the lower lateral cartilages are removed. In non-anatomical terms, it affects the area just above your nasal tip. It is used to slightly elevate the nasal tip and to remove bulk from this area in a boxy or bulbous nose. Surgeons need to be careful to leave enough cartilage behind to prevent collapse; for this reason I will actually use a set of calipers to measure the cartilage while in the operating room to ensure I don't take too much. Good luck!

Cephalic trimming is a step in Rhinoplasty frequently done to reduce the width of the Alar cartilage and to make the Nasal tip look better specially in wide amorphous tip but their is a risk if too much of the lateral crus is removed by Cephalic trimming it can cause pinched nose and Alar collapse. Many surgeons are now using Alar flaps where the cephalic portion of excess lateral crus is folded which reduces the width of cartilage and at the same time strengthens the remaining  cartilage

Hello, and thanks for your question. In a cephalic trim, the upper part (i.e. closer to the root of the nose than the tip of the nose) of the lower lateral cartilage (the cartilages in the nasal tip) are resected.  At least 6 mm of the cartilage should be left in place for structural support and stability.  This technique can help to refine the nasal tip.

Thank you for your question. The middle and lower parts of the nose are composed of several different cartilages that give the nose shape and structure. The paired lower lateral cartilages make up your tip, sides of the nostrils and columella (structure between the nostrils). In a cephalic trim, the cephalic edge (superior edge) of the lateral aspect of the lower lateral cartilage is removed. This maneuver can be used to refine or decrease bulbosity in the tip. If too much is removed or if the maneuver isn't properly executed, it can lead to unnatural tip pinching and breathing issues. The best way to avoid this is to consult with a board certified facial plastic surgeon or plastic surgeon who has extensive experience in rhinoplasty. Good luck! 

Cephalic trims imply that the middle part (closer to the top of the nose vs. the bottom) are removed form the lateral crura of the lower lateral cartilages. This is done as it will not leave any irregularity at the level of the nostril or alar groove. 
Caudal means towards the feet and is the opposite direction. 
Hope this helps.

Trimming of the cephalic (superior aspect) portion of the lower lateral cartilage will thin the boxy or blunt tip and lessen its contribution to supratip height and will provide more tip definition. 
Seek full explanation from a board certified plastic surgeon.
Best wishes...