The supratrochlear artery (or frontal artery), one of the terminal branches of the ophthalmic artery

Ophthalmic artery

The ophthalmic artery is the first branch of the internal carotid artery distal to the cavernous sinus. Branches of the OA supply all the structures in the orbit as well as some structures in the nose, face and meninges...

, branches off where the ophthalmic travels posterior to the trochlea

Trochlea of superior oblique

The Trochlea of superior oblique is a pulley structure in the eye. The tendon of the superior oblique muscle passes through it. Situated on the superior nasal aspect of the frontal bone, it is the only cartilage found in the normal orbit....

.

Course

It leaves the orbit

Orbit (anatomy)

In anatomy, the orbit is the cavity or socket of the skull in which the eye and its appendages are situated. "Orbit" can refer to the bony socket, or it can also be used to imply the contents...

 at its medial angle by piercing the orbital septum

Orbital septum

The orbital septum is a membranous sheet that acts as the anterior boundary of the orbit. It extends from the orbital rims to the eyelids...

 with the supratrochlear nerve

Supratrochlear nerve

The supratrochlear nerve is a branch of the frontal nerve, which itself comes from the ophthalmic division of the trigeminal cranial nerve.It is smaller than the nearby supraorbital nerve...

, and, ascending on the forehead, supplies the integument, muscles, and pericranium, anastomosing with the supraorbital artery, and with the artery of the opposite side.

External links

• Diagram at stchas.edu
• http://www.dartmouth.edu/~humananatomy/figures/chapter_47/47-2.HTM