http://www.sciencedirect.com/science/article/pii/S1388245705001410
   Hippocampal-orbitofrontal connectivity in human: An electrical
   stimulation study H. Catenoixa, d, M. Magninb, d, M. Gu*notc, d,
   J. Isnarda, d, F. Maugui*rea, d, P. Ryvlina, d, , Show more
   Abstract Objective The identification of the pathways involved
   in seizure propagation remains poorly understood in humans. For
   instance, the respective role of the orbitofrontal cortex (OFC)
   and of the commissural pathways in the interhemispheric
   propagation of mesial temporal lobe seizures (mTLS) is a matter
   of debate. In order to address this issue, we have directly
   tested the functional connectivity between the hippocampus and
   the OFC in 3 epileptic patients undergoing an intra-cranial
   stereotactic EEG investigation. Methods Bipolar electrical
   stimulations, consisting of two series of 25 pulses of 1 ms
   duration, 0.2 Hz frequency, and 3 mA intensity, were delivered
   in the hippocampus. Evoked potentials (EPs) were analysed for
   each series, separately. Grand average of reproducible EPs was
   then used to calculate latency of the first peak of each
   individual potential. Results Hippocampal stimulations evoked
   reproducible responses in the OFC in all 3 patients, with a mean
   latency of the first peak of 222 ms (range: 185*258 ms).
   Conclusions Our data confirm a functionnal connectivity between
   the hippocampus and the OFC in human. Significance This
   connectivity supports the potential role of the OFC in the
   propagation of mTLS. Keywords Epilepsy; hippocampus;
   Orbito-frontal cortex; Intra-cranial electrical stimulation;
   Connectivity Corresponding author. Address: H*pital
   Neurologique, 59 Bd Pinel, Lyon 69003, France. Tel.: +33 4 72 35
   79 02; fax: +33 4 72 35 73 97.

  Medial temporal lobe

   The medial temporal lobe consists of structures that are vital
   for declarative or long-term memory. [1]Declarative (denotative)
   or [2]explicit memory is conscious memory divided into
   [3]semantic memory (facts) and [4]episodic memory
   (events).^[5][4]^:194 Medial temporal lobe structures that are
   critical for long-term memory include the hippocampus, along
   with the surrounding [6]hippocampal region consisting of the
   [7]perirhinal, [8]parahippocampal, and [9]entorhinal neocortical
   regions.^[10][4]^:196 The hippocampus is critical for memory
   formation, and the surrounding medial temporal cortex is
   currently theorized to be critical for memory
   storage.^[11][4]^:21 The [12]prefrontal and visual cortices are
   also involved in explicit memory.^[13][4]^:21 Research has shown
   that lesions in the hippocampus of monkeys results in limited
   impairment of function, whereas extensive lesions that include
   the hippocampus and the medial temporal cortex result in severe
   impairment.^[14][5] Functionally distinct pathways for auditory
   processing in the orbitofrontal cortex include a rostral stream
   associated with phonetic processing, and a more caudal stream
   terminating just posterior to the orbitofrontal cortex in the
   periarcuate prefrontal cortex associated with auditory-spatial
   processing, though these connections share extensive overlap.
   Both ventral and dorsal visual streams share connections with
   orbitofrontal cortical areas, including rich projections to and
   from the superior temporal pole, important for integration of
   spatial and object processing.^[15][8]
   http://en.wikipedia.org/wiki/Orbitofrontal_cortex

References

   Visible links
   1. Declarative memory
	http://en.wikipedia.org/wiki/Declarative_memory
   2. Explicit memory
	http://en.wikipedia.org/wiki/Explicit_memory
   3. Semantic memory
	http://en.wikipedia.org/wiki/Semantic_memory
   4. Episodic memory
	http://en.wikipedia.org/wiki/Episodic_memory
   5. http://en.wikipedia.org/wiki/Temporal_lobe#cite_note-smith07-4
   6. Hippocampal formation
	http://en.wikipedia.org/wiki/Hippocampal_formation
   7. Perirhinal cortex
	http://en.wikipedia.org/wiki/Perirhinal_cortex
   8. Parahippocampal gyrus
	http://en.wikipedia.org/wiki/Parahippocampal_gyrus
   9. Entorhinal cortex
	http://en.wikipedia.org/wiki/Entorhinal_cortex
  10. http://en.wikipedia.org/wiki/Temporal_lobe#cite_note-smith07-4
  11. http://en.wikipedia.org/wiki/Temporal_lobe#cite_note-smith07-4
  12. Prefrontal cortex
	http://en.wikipedia.org/wiki/Prefrontal_cortex
  13. http://en.wikipedia.org/wiki/Temporal_lobe#cite_note-smith07-4
  14. http://en.wikipedia.org/wiki/Temporal_lobe#cite_note-5
  15. http://en.wikipedia.org/wiki/Orbitofrontal_cortex#cite_note-Cavada-8