  We compute the zero temperature dynamical structure factor $S({\bf
q},\omega)$ of the triangular lattice Heisenberg model (TLHM) using a Schwinger
boson approach that includes the Gaussian fluctuations ($1/N$ corrections) of
the saddle point solution. While the ground state of this model exhibits a
well-known 120$^{\circ}$ magnetic ordering, experimental observations have
revealed a strong quantum character of the excitation spectrum. We conjecture
that this phenomenon arises from the proximity of the ground state of the TLHM
to the quantum melting point separating the magnetically ordered and spin
liquid states. Within this scenario, magnons are described as collective modes
(two spinon-bound states) of a spinon condensate (Higgs phase) that
spontaneously breaks the SU(2) symmetry of the TLHM. Crucial to our results is
the proper account of this spontaneous symmetry breaking. The main qualitative
difference relative to semi-classical treatments ($1/S$ expansion) is the
presence of a high-energy spinon continuum extending up to about three times
the single-magnon bandwidth. In addition, the magnitude of the ordered moment
($m=0.224$) agrees very well with numerical results and the low energy part of
the single-magnon dispersion is in very good agreement with series expansions.
Our results indicate that the Schwinger boson approach is an adequate starting
point for describing the excitation spectrum of some magnetically ordered
compounds that are near the quantum melting point separating this Higgs phase
from the {\it deconfined} spin liquid state.
