Triangles

Question 1

Borders of the clinoidal (anteromedial) triangle.

Answer 1

1. Optic nerve.
2. Occulomotor nerve.
3. Tentorial edge.

Question 2

Contents of the clinoidal triangle.

Answer 2

1. Anterior clinoid process.

2. Clinoidal ICA.

Question 3

Borders of the occulomotor (medial) triangle.

Answer 3

1. Anterior petroclinoid dural fold.
2. Posterior petroclinoid dural fold.
3. Interclinoid dural fold.

Question 4

Another name for the occulomotor triangle.

Answer 4

Habuka’s triangle.

Question 5

Contents of Habuka’s triangle.

Answer 5

1. Occulomotor nerve.

2. Horizontal segment of the ICA.

Question 6

Borders of the supratrochlear (paramedian) triangle.

Answer 6

1. Occulomotor nerve.
2. Trochlear nerve.
3. Tentorial edge.

Question 7

Contents of the supratrochlear triangle.

Answer 7

1. Meningohypophyseal trunk.

Question 8

Borders of Parkinson’s (infratrochlear) triangle.

Answer 8

1. Trochlear nerve.
2. Ophthalmic division (V1).
3. Tentorial edge.

Question 9

Contents of Parkinson’s triangle.

Answer 9

1. Cavernous ICA.

2. Abducens nerve.

Question 10

Borders Mullan’s triangle (anteromedial middle fossa).

Answer 10

1. Ophthalmic nerve (V1).
2. Maxillary nerve (V2).
3. A line connecting the superior orbital fissure and foramen rotundum.

Question 11

Contents of Mullan’s triangle.

Answer 11

1. Sphenoid sinus.
2. Ophthalmic vein.
3. Abducens nerve.

Question 12

Borders of the anterolateral middle fossa triangle.

Answer 12

1. Maxillary nerve (V2).
2. Mandibular nerve (V3).
3. A line connecting foramen rotundum and foramen ovale.

Question 13

Contents of the anterolateral middle fossa triangle.

Answer 13

1. Lateral sphenoid wing.
2. Sphenoid emissary vein.
3. Cavernous-pterygoid venous anastamosis.

Question 14

Borders of Glasscock’s triangle.

Answer 14

1. Mandibular nerve (V3).
2. Greater superficial petrosal nerve.
3. A line from the foramen spinosum to arcuate eminence.

Question 15

Contents of Glassocock’s triangle.

Answer 15

1. Foramen spinosum.
2. Horizontal petrous ICA (for anastamosis).
3. Infratemporal fossa.

Question 16

Borders of Kawase’s triangle (also known as the rhomboid).

Answer 16

1. Mandibular nerve (V3).
2. GSPN.
3. Arcuate eminence.
4. Superior petrosal sinus.

OR

1. GPSN.
2. Arcuate eminence.
3. A line connecting the hiatus fallopii and Meckel’s cave.

Question 17

Contents of Kawase’s triangle.

Answer 17

1. Petrous apex.
2. IAC.
3. Vertebrobasilar junction.

Question 18

Borders of the inferolateral triangle of the middle fossa.

Answer 18

1. A line from the dural entries of the trochlear and abducens nerve.
2. A line from the dural entries of the abducens nerve and the petrosal vein.
3. The petrous apex.

Question 19

Contents of the inferolateral triangle of the middle fossa.

Answer 19

1. Porous trigeminii (dural opening into Meckel’s cave).

Question 20

Contents of the inferomedial triangle of the middle fossa.

Answer 20

1. Porous abducens (dural opening into Dorello’s canal).

2. Gruber’s ligament.